removed drag-to-select interaction from calendar (because it's not used very much and so that I can embed the calendar in a scroll view)
added UI for day toggling
saves the day selection now
calendar now represents required state
presenting chains nicely with optional days
made appearance more consistent in detail screen
Fixed a bug no entering foreground
Fixed crash on navigating within calendar
Fixed splash screen graphic.
Put reminder picker at right position.
Improved visibility of draggability.
Made sure new habits are added to the end of the list. NB: WIP on targetChainLength calculation (was very slow and hence is skipped in this commit)
Cached longest chain length (haven't checked on slower phone but seems fine on iPhone 5 now)
Sorted out weird bubblewrap thing.
Changed notifications to support optional weekdays.
Updated habit list presentation.
tried adding a travis file
made calendar navigation a bit more stable, changed count presentation, improved check box performance
added little easter egg thingy and first-run tooltip
Could crash.