Refactor [start timer] call to App Controller
Add idea note to Sounds class
Rename Sounds class to SoundFileController
Set custom timer buttons to visible
Sketch out methopds for custom timer
Populate custom buttons from NSUserDefaults
Fix button drawing for custom timers
Change custom time dialog to look abit better
Add cancel button and action for text field end editing
Tidy up code
Hook up custom durations to main interface buttons
Bump version and update README.md
Merge branch 'feature/customTimers' into develop
Code sign app
Bump version and update README.md
Merge branch 'release/v0.7.5'