Change version to 0.5.0-SNAPSHOT
reorg README and link to latest release
Use Travis CI to build/upload runnable jars to s3
Misc travis-ci build tweaks

* Add faraday_middleware gem to address travis-artifacts error:
    /home/travis/.rvm/gems/ruby-1.9.3-p484/gems/faraday-0.9.0.rc7/lib/faraday.rb:189:in `lookup_middleware': :json is not registered on Faraday::Response (Faraday::Error)
* Move gem install to after_success so builds that fail, fail faster
* Make PROJECT_VERSION available to all build stages
Pin to faraday version 0.8.9

To address: https://github.com/travis-ci/travis-artifacts/issues/23
Farady 0.8.9 is the latest version known to work with travis-artifacts.
Add shasum and adjust upload paths
TRAVIS_BRANCH may have spaces

(Also test that artifact uploads with the same version will overwrite
each other.)
Make sure 404 responses have the proper mime type and a message. Fixes #176
Add companies using Marathon
Fixed #170 - App update ignores value for URIs.
Build a tgz artifact modeled on past releases
Use a hyphen instead of underscore
Use a hyphen instead of underscore
Work in progress.
Prevent losing data about active checks if our actor is restarted.
Allow multiple HealthCheckDefinitions per AppDefinition.
Actually do the health check.
Add health checks upon app creation as well as update.
Fix test build break.
Remove circular dependency from injected dependencies. Replace AddAll with Insert accepting a collection.