Merge branch 'release/0.6'
add new travis build status link
fix end date bug
prevent false matches for 'schedule' url
updated url tag usage for Django 1.5 compatibility
updated url tag usage for Django 1.5 compatibility
updated url tag usage for Django 1.5 compatibility
fix TypeError on calendar list view

also, renamed the view 'calendar_list', as 'schedule' is the name of the last rule in the conf as well.
allow nullable FK to 'calendar' from Event model

As is, the admin seems to indicate 'calendar' is optional (from the blank=True rule) but validation requires a selection.  This way, events can be saved to a default calendar.
fixed reference to fixtures in manifest
fix Event.__unicode__() method 

Perhaps i misunderstand the original intent of that method, but rendering a date with 'l, DATEFORMAT' as the format creates a weird string like "My Event: Wednesday, WedPMCDTMay_May-0500RMayPMCDT-Wednesday, WedPMCDTMay_May-0500RMayPMCDT" so i changed it so it will render like "MyEvent: May 22, 2013 - May 22, 2013" instead.
Merge pull request #4 from smcoll/patch-1

prevent false matches for 'schedule' url
Merge pull request #6 from smcoll/patch-2

fix TypeError on calendar list view
Merge pull request #7 from smcoll/patch-3

updated 'url' template tags to support syntax required for Django 1.5
Merge pull request #8 from smcoll/patch-4

allow nullable FK to 'calendar' from Event model
Merge pull request #9 from smcoll/patch-5

fixed reference to fixtures in manifest
Merge pull request #10 from smcoll/patch-6

fix Event.__unicode__() method
prevent TypeError when comparing naive and aware dates in get_occurrence()

The date param is potentially timezone-naive (as i ran into with Occurrence.get_absolute_url), so coercing as timezone-aware.  This is perhaps not the best way to have fixed this bug, so please review, but it is a fix nonetheless.
prevent form validation from insisting on Event.creator

since it is nullable
Merge pull request #12 from smcoll/patch-8

prevent form validation from insisting on Event.creator