Merge pull request #66 from johnnyshields/aliased_fields

Support for aliased fields + README update
added new functionality to fetch history tracks by wrapper object
groupped history tracks
catch errors
syntax error fixed
refactoring
latest refactorings
customize group by method
groupping history tracks against given value
history_group_id can be set inside controller
customize groupping
bug is fixed
added conditions to groupping
refactoring
fixex bug