Merge pull request #54 from acmetech/master

Initial migration to squeel
placeholder
 refactor the query building to a new method
refactor to use squeel. still need to refactor the limited_sql

#52
more refactoring of the activity model to use squeel

This is generating the same sql as before the refactoring.

#52
Merge pull request #55 from acmetech/refactor_activity_stream

Refactor activity stream