Events editable in wagtail admin

With this release:

• Fixed bug stopping EventIndex page from being added to a parent, even the site root or home page, within the wagtail admin.
• Events are added to the wagtail explorer sidebar for quick list/create shortcut
• Wagtail Homepage shows a number of events overview
• Package details including readme updated to display correctly on pypi
• Fixed need to import package to get version when parsing setup.py
• Templates and static files are correctly added to the package