Implemented two new features.

Added start to query function for easy pagination. Similar to SQL Limit By: ( limit, start )

In Example:
limit = per_page.
start = (page - 1) * per_page

Added tableKeys function to return the fields of a table.

Updated validation so that if can actually use a full numeric value as a db,table,field name.
Added Limit (Query), TableKeys, Removed Duplicate.
Added Limit (Query), TableKeys, Removed Duplicate.
Comment update.

Comment Update.
a904guy's tableFields() and offset support for query()