Ability to fetch as objects of specified class. Fixes #25

Sadly, I have no idea how to test this without DB.
Fixes #40. Ability to use RAW statements in criterias
Merge pull request #41 from neoascetic/features/raw-statement-in-where

Fixes #40. Ability to use RAW statements in criterias
Fixes #44. Execution time as third parameter of after-* events
Merge pull request #45 from neoascetic/features/query-execution-time

Fixes #44. Execution time as third parameter of after-* events
Merge branch 'feature/fetch-as-object' of github.com:neoascetic/pixie

Conflicts:
	src/Pixie/QueryBuilder/QueryBuilderHandler.php