refactor the index action to use squeel

#52
refactor the person model to use squeel and simplify some of the methods

#52
refactor the activity object to use squeel and dry things up

#52
Merge pull request #53 from acmetech/master

Audience.scope to Audience.privacy_level and change the data type to integer
Update fr.yml
Merge remote-tracking branch 'upstream/master'
change case
initial refactoring of the activity model to use squeel
code format
commented out some code for possible future use