SSP-1087 Migrate to date-only task due dates

This is a squashed cherry-pick of three commits, plus some fix up
for aggr/min js.

cfc67fd095c4401323e09e6d1eb6048c83d1133a --
The meat commit. Trivial conflicts. Did regenerate all of the JS files from
CoffeeScript files.

Conflicts:
	.gitignore
	src/main/resources/org/jasig/ssp/database/masterChangeLog.xml
	src/test/resources/org/jasig/ssp/database/masterChangeLog-test.xml

61dffba9e97839e7eb460187a13008d7623f8e1e --
Hides the 'today' button when selecting a due date

f3fa74d903fadb834b447db035cd388c49d024be --
Adds tool tips for task due dates