Fixes a rounding issue when calculating the number of days.

When creating new events in the week containing the 1st April 2014, the new events were misaligned partially covering two columns.  This was the result of a rounding issue, when calculating the number of days during the creation of an event, the rounding issue meant that only 8 days were used in the calculations instead of 9.  This didn't impact visually on the calendar grid, but did instead affect the modification layer and the rails used to align events to, which meant that when dragging out new events using the <code>Ctrl + mous down</code> short cut, both the proxy and the finalized event were misplaced.  This misplacement of events was still visible if using the control panel in the sample, or loading an event that was defined through a module controller.  For each of these scenarios this issue has now been resolved.