2.1.0 RC1 Release

This is the first release candidate release for AppSensor version 2.1.0.
Assuming no significant bugs, we'll move to at least 1 more release candidate, aiming for a v2.1.0 final release in the June 2015 timeframe.

This release contains a number of new features, which are listed here: https://github.com/jtmelton/appsensor/blob/dev-v2.1/changelog.txt

This release will additionally resolve the following tickets:
#19
#9
#12