Made the library respect the PDO::FETCH_OBJ option

Some of us like to return our rows as objects instead of an array. :)
Fixed several code comments and minor code stylings

A couple variables that might not ever be defined, etc. Nothing crazy.
Changed references of FluentQuery to SelectQuery
Added checking to see if the FETCH mode was default.

If it's the default, it resets to FETCH_ASSOC. All tests work.
Added the ability to specify columns to return

This is useful for COUNT(*), etc.
Added the fetchColumn function passthru.
Added a test for fetchColumn
Removed the ->columns() method.

->select(null)->select('column') should be used instead.
Added a new test and fixed a couple other tests for consistency
Merge pull request #12 from beaudesigns/master

Made the library respect the PDO::FETCH_OBJ option