MIST-189 Make the image service configurable
MIST-189 Add *.swp to .gitignore
MIST-189 Tests for the Image Actions

Stubbed out the various image methods in the Test subagent.
Added requests to the image-related endpoints to test.sh and got them
passing
Merge pull request #19 from mistifyio/MIST-189

MIST-189 Make the image service configurable