Moving some things around to prepare for the document render agent.
Adding pdf support to image magick render agent.
Adding case for pulling the first frame of a gif for renders within the image magick render agnet.
Filling in stub logic for document render agent.
Code cleanup in prep for document render agent tests.
Adding document render tests, bug fixes and config changes.
Updating readme and cleaning broken/disabled tests.
Cleanup in document render agent.
Code cleanup and test fixes.
Merge pull request #1 from ngerakines/feature-document-convert

Merging feature-document-convert branch to master.