Merge pull request #296 from AndyScherzinger/master

 implementation for #117 - showing toggle data/graph in actionbar 
Merge pull request #298 from AndyScherzinger/master

Changelog 2.4.0
Merge pull request #299 from AndyScherzinger/master

minor design fixes for comments + xhdpi icons
Merge pull request #300 from AndyScherzinger/master

fixed typos
Merge pull request #301 from AndyScherzinger/master

typo fix
in-app changelog for 2.4.0