Merge pull request #110 from visible-difference/feature

feature merges into develop
Merge pull request #111 from visible-difference/develop

Develop merge into master
Merge pull request #112 from visible-difference/feature

feature merges into develop
Merge pull request #113 from visible-difference/develop

Develop merge into master
Merge pull request #114 from visible-difference/feature

migration and model tests
Merge pull request #115 from visible-difference/develop

Develop merge into master
Merge pull request #116 from visible-difference/feature

feature merges into develop
Merge pull request #117 from visible-difference/develop

Develop merge into master
trying a fix for collection select for heroku crash
remove binding pry