Added pkg directory to ignore
Added the gem tasks to rake
Refactored ActiveRecord version checking
Added ability to run against a specific migration
version:

Example:

$ rake db:migrate_sql VERSION=20130620180114
Bumped version to 1.5.2
Merge branch 'master' of https://github.com/johnschult/lol_dba

Conflicts:
	lib/lol_dba/version.rb