ignore node_modules directory
Merge pull request #922 from wilmoore/ignore-node-modules

ignore node_modules directory
Add rake task for clearing out old notifications
Add rake task to clear out invalid emails
Change flash message on hibernation
Specify the db host in development environment. Fixes #921.

Some machines don't make that assumption. May as well be explicit about
it.
added test db migration to README.md
Merge pull request #924 from bjhaid/master

added test db migration to README.md
forgot =test :-(
Add logo
Merge pull request #925 from bjhaid/master

forgot =test :-(
Nuke the css cache
added nitpicks to email notification
Parallel letter frequency in Elixir

This test encourages users to use a parallel approach.
Parallel letter frequency in Haskell
Merge pull request #928 from pminten/parallel-letter-freq

Parallel letter freq
Merge pull request #927 from bjhaid/master

added nitpicks to email notification fix for  [https://github.com/kytrinyx/exercism.io/issues/918]
Update link to CLI download
Use exercism.io email address
Reference repository in exercism organization