Implement full type handling for schemaless mode

[retrography]

The complete list of types for the schemaless mode:

• 'f' for float
• 'c' for decimal
• 'l' for long
• 'd' for double
• 'b' for byte and binary
• 'a' for date
• 't' for datetime
• 's' for short
• 'e' for Set, because arrays and List are serialized as arrays like [3,4,5]
• 'x' for links
• 'n' for linksets
• 'z' for linklist
• 'm' for linkmap
• 'g' for linkbag

Fetched from: http://orientdb.com/docs/last/orientdb.wiki/OrientDB-REST.html#json-data-type-handling-and-schema-less-mode