Adding a link to email subscription page to CONTRIBUTING file
Adding license badge.

Closes #388
Added logic for selecting default plugin file when none is supplied

This fixes a problem with the default front page not working when Tangelo is
invoked without any options.
Using non-bolded magenta for info statements
Merge branch 'default-plugin' into plugin-system
Adding logic to try a final, hard-coded location for web root and plugins
Merge branch 'mac-quirkiness' into plugin-system

Closes #431
Adding step about installing PyMongo.  Triggering error message when ajax call to mongo service fails
Correctly writing angle brackets in HTML
Putting info about hosted file first
Merge branch 'fix-flickr-error-message' into plugin-system
Merge branch 'plugin-system' into develop
Bumping version number for release
Fixing name of javascript file in version task
Updating version number in source files
Bumping version number in client test
Bumping version number for development
Adding instructions for creating release
Added instruction for uploading to PyPI.
Updating release documentation after experience releasing 0.8