Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Fix an issue the cell of next month appears to be selectable

Fix an issue when Feb 1st is Saturday Mar 2nd appears to be selectable.
See Issue #1540: https://github.com/yui/yui3/issues/1540
[calendar] Add test case for bug #1540

Test the bug #1540 that the style of the day of the next month
can be selected when you are showing the next month on a calendar.
Merge remote-tracking branch 'shunner/calendar-feb-next' into dev-master
Merge branch 'calendar-tests' into dev-master
[calendar] Build
[calendar] Tweak history