Merge pull request #58 from mredar/master

Adding filter on harvest_type and catching bad harvest data earlier
Merge pull request #59 from mredar/master

Add harvest action to Collection Admin object page
Merge pull request #60 from mredar/master

Don't create a new process for each requested harvest.
Merge branch 'master' of https://github.com/ucldc/avram
Merge pull request #61 from mredar/master

Improve OAC sync code.
Merge branch 'master' of https://github.com/ucldc/avram
Add 'SLR' - Solr Index to harvest type choices.