Documentations for columns.
Fixed doc for boolean column
Docs for boolean, date colums.
ping @fsi-open
Added list of available comparision types.

ping #fsi-open
quick fix - code tag
docs for doctrine driver
Moved shared content to a new file. Added docs for collection driver.
fixed field type for number,
restored version without shared available options
Removed comparision types for fields.
New version of doc for boolean and datetime columns.
Improved names and types of fields.
Fixed version.
Merge pull request #34 from partikus/master

Documentations for columns.