Improve autocompletion

Move autocompletion code to a new shell file. In .bash_profile, .bashrc and .zshrc add code that executes this code when we want to enable autocompletion.
Autocomplete is now hierarchical command. The subcommands and their behavior is:
* `autocomplete` - checks if autocompletion is enabled. In case it is not, ask the user for confirmation. In case autocompletion is enabled, but it is the old one (where we've written some data to .bash_profile, etc.), silently remove the old code and use the new approach. In case the user chooses to not use autocompletion, call disableAutocCompletion in order to remove all autocompletion code from all shell profiles.
* `autocomplete enable` - enables autocompletion in case it is not already enabled.
* `autocomplete disable` - disables autocompletion in case it is not already disabled.
* `autocomplete status` - prints the current status of autocompletion.

Add help for autocomplete commands.

Author: rosen-vladimirov

docs/man_pages/general/autocomplete-disable.md

@@ -0,0 +1,24 @@
+autocomplete disable
+==========
+
+Usage | Syntax
+------|-------
+General | `$ tns autocomplete disable`
+
+
+Disables autocompletion for bash and zsh.
+
+> NOTE: This will modify your .bash_profile, .bashrc and .zshrc files.
+
+<% if(isHtml) { %> 
+
+#### Related Commands
+
+Command | Description
+----------|----------
+[autocomplete-status](autocomplete-status.html) | Shows if autocompletion is enabled for bash and zsh.
+[autocomplete](autocomplete.html) | Asks for confirmation if command line autocompletion should be enabled for bash and zsh.
+[autocomplete-enable](autocomplete-enable.html) | Enables autocompletion for bash and zsh.
+[feature-usage-tracking](feature-usage-tracking.html) | Configures anonymous usage statistics tracking for the NativeScript command-line interface.
+[help](help.html) | Lists the available commands or shows information about the selected command.
+<% } %>

docs/man_pages/general/autocomplete-enable.md

@@ -0,0 +1,21 @@
+autocomplete enable
+==========
+
+Usage | Syntax
+------|-------
+General | `$ tns autocomplete enable`
+
+
+Enables autocompletion for bash and zsh.
+
+> NOTE: This will modify your .bash_profile, .bashrc and .zshrc files.
+
+<% if(isHtml) { %> 
+
+#### Related Commands
+
+Command | Description
+----------|----------
+[feature-usage-tracking](feature-usage-tracking.html) | Configures anonymous usage statistics tracking for the NativeScript command-line interface.
+[help](help.html) | Lists the available commands or shows information about the selected command.
+<% } %>

docs/man_pages/general/autocomplete-status.md

@@ -0,0 +1,22 @@
+autocomplete status
+==========
+
+Usage | Syntax
+------|-------
+General | `$ tns autocomplete status`
+
+
+Shows if autocompletion is enabled for bash and zsh.
+
+<% if(isHtml) { %> 
+
+#### Related Commands
+
+Command | Description
+----------|----------
+[autocomplete](autocomplete.html) | Asks for confirmation if command line autocompletion should be enabled for bash and zsh.
+[autocomplete-enable](autocomplete-enable.html) | Enables autocompletion for bash and zsh.
+[autocomplete-disable](autocomplete-disable.html) | Disables autocompletion for bash and zsh.
+[feature-usage-tracking](feature-usage-tracking.html) | Configures anonymous usage statistics tracking for the NativeScript command-line interface.
+[help](help.html) | Lists the available commands or shows information about the selected command.
+<% } %>

docs/man_pages/general/autocomplete.md

@@ -1,18 +1,26 @@
 autocomplete
 ==========
 
-Turns on command line autocompletion for bash and zsh.
+Usage | Syntax
+------|-------
+General | `$ appbuilder autocomplete`
+Get status | `$ appbuilder autocomplete status`
+Enable | `$ appbuilder autocomplete enable`
+Disable | `$ appbuilder autocomplete disable`
 
-Usage:
-    `$ tns autocomplete`
 
-> NOTE: this will modify your .bash_profile, .bashrc and .zshrc files.
+Asks for confirmation if command line autocompletion should be enabled for bash and zsh.
+
+> NOTE: This will modify your .bash_profile, .bashrc and .zshrc files.
 <% if(isHtml) { %> 
 
 #### Related Commands
 
 Command | Description
 ----------|----------
+[autocomplete-status](autocomplete-status.html) | Shows if autocompletion is enabled for bash and zsh.
+[autocomplete-enable](autocomplete-enable.html) | Enables autocompletion for bash and zsh.
+[autocomplete-disable](autocomplete-disable.html) | Disables autocompletion for bash and zsh.
 [feature-usage-tracking](feature-usage-tracking.html) | Configures anonymous usage statistics tracking for the NativeScript command-line interface.
 [help](help.html) | Lists the available commands or shows information about the selected command.
 <% } %>