Add active support dependency
Implement active support
Change variable name
Merge pull request #23 from scienceexchange/params

Params
Fix optional params
Rename url helper method
Fix comments
Merge pull request #24 from scienceexchange/params

Fix optional params
Merge remote-tracking branch 'upstream/master'
Add logger
Merge pull request #25 from scienceexchange/logger

Add logger
Merge pull request #8 from scienceexchange/master

Improve methods with optional params