implement notification sender, send on low balance
improved tests
test if notification gets sent when limit passed
some refactoring, cleaning up classes
test refactoring
handle cases where a user has no email address set
change error into warning
remove unnecessary empty line
resolve project ids into names in cronjob output
rename KeystoneClientSingleton to KeystoneClient
Updated email text
Merge branch 'notify_on_low_balance' of github.com:kili/dashboard into notify_on_low_balance
Merge pull request #47 from kili/notify_on_low_balance

Notify on low balance