Merge pull request #164 from pulp/rbarlow-release-notes

Added the beginnings of our release notes.
renaming units_applicable api to find_applicable_units
Merge pull request #167 from pulp/skarmark-928509

renaming units_applicable api to find_applicable_units
Automatic commit of package [pulp-rpm] release [2.1.0-0].
Docs: Updated version to 2.1
Merge commit '971e56f2c456d8cc54bb14537e9f59120d803dc1'
Merge branch 'pulp-2.1'
Merge remote-tracking branch 'origin/master' into mhrivnak-newimporter