- update/add copyright headers
- Remove Rock.Plugin project and move classes to Rock.Core
Merge branch 'origin/feature-dt-plugin'

Conflicts:
	Rock.Plugin/MigrationNumberAttribute.cs
	Rock.Plugin/Rock.Plugin.csproj
	Rock.Plugin/VersionAttribute.cs
	Rock/Plugin/VersionAttribute.cs
	Rock/Rock.csproj
- updated checkin client configuration
- fixed styling issue with active users
- cleanup of checkin client
- css updates
- removed 'debugger' from google maps tool
- Start new Email action
- Fix a few compiler warnings
- Update page deletes to update associated page views to have null page
- Remove Excel export option from child pages and zone block grids
- Fix person rollover on known relationships
- added theming to flot charts and some cleanup
- rename ChartTheme to ChartStyle
- fix bug in NotificationBox where toggling the details wouldn't work if there were multiple notification boxes on the page
- start of gray look
- fixed styling issue with active users
- cleanup of checkin client
- changed columns on checkin editor to respond more friendly
- bio block edits for social media and following (static mockup)