convert engine into railtie
update dependency version
Merge pull request #18 from phlipper/railtie

convert engine into railtie
Merge pull request #19 from phlipper/update-dependencies

update dependency version
bump version
update dependency versions
Merge pull request #20 from phlipper/update-dependencies

update dependency versions
bump version to 0.6.0
update dependency requirements
update minitest and mocha dependency versions
Merge pull request #22 from phlipper/dependency-updates

Dependency updates
bump version to 0.7.0
add progress bar formatter:

* rainbows are prettier, but this is more 
  functional for large projects
Merge pull request #23 from phlipper/reporters

Add progress bar formatter
bump version to 0.8.0