Fix some z-index issues

Work done:
-change the tmpl day, for render the hour panel before than the events.
-change the calendar.css, removed the z-index for the hour panel, and
add a position relative for day-event
-Same that last point on less.

That not should doing any visual change, only fixes some z-indexs issues
for particular layouts
Merge pull request #369 from eleazan/master

Fix some z-index issues