Feature/add edit text option to prompt dialog

[Rahul1d]

Added a Edit Text Option to the prompt Dialog.

Sample code to add Edit text;

 new PromptDialog(this)
                .setDialogType(PromptDialog.DIALOG_TYPE_EDIT)
                .setAnimationEnable(true)
                .setTitleText("EDIT")
                .setContentText("Sub Title")
                .setEditTextHint("Enter Text")
                .setPositiveListener(getString(R.string.edit), new PromptDialog.OnPositiveListener() {
                    @Override
                    public void onClick(PromptDialog dialog) {
                        dialog.dismiss();
                        Toast.makeText(MainActivity.this,dialog.getEditText().getText().toString(),Toast.LENGTH_LONG).show();
                    }
                }).show(); 

I have attached the Demo here: