Merge pull request #689 from code-dot-org/test

DTP
tests
change sharing urls again since they were broken
fix share images for special script
Merge pull request #700 from code-dot-org/staging

DTT
Don't automigrate datamapper on every load, only do it during rake db:migrate
Merge pull request #702 from code-dot-org/test

DTP
Merge pull request #707 from code-dot-org/staging

DTT
DTT
Merge pull request #716 from code-dot-org/test

DTP
Merge branch 'staging' into test
Merge branch 'production' of github.com:code-dot-org/code-dot-org into test