Remove Hash#symbolize_keys.  Rename to lg-settingslogic

* This method was being added to Hash.  It is also added to Hash by
ActiveSupport.  They have the same method signature, but different behaviors.
This was causing issued when passing a Hash from SettingsLogic into the
ActiveRecord configuration, which would call symbolize_keys, but instead
of the AcitiveSupport Hash#symbolize_keys Settingslogic
Hash#symbolize_keys was being invoked and causing problems.

* Rename this gem to lg-settingslogic, since it is a fork of that
library we don't want to confuse it with the original library