Fix #223
Extend grayed out bounds of timeline so you can't scroll down enough to see them end.
Revert "Fix #224"

This reverts commit 9af2613244b3c3ba2d8a6084207a823c85857d25.
Fix #224
Fix #223 Don't assume calendar grid origin as zero.
Fix #225
Merge branch 'master' of https://github.com/devinross/tapkulibrary into experimental