Added functionality for username check when changed, error displays in console log for now
Fixed sign-up index for username input
Fixed method invocation for checking username on change
Now successfully checks if usename is taken. Needs visual display. Currently prints result in console.
Changed vue from onChange to onKeyup for detection while the user is typing rather than when a change is made and focus leaves the input box
Fixed quotes, added localization, and used v-if to handle delivery of error message via errors model
Merge branch 'master' of github.com:mozillafordevelopment/webmaker-app into contrib
Resolve merge conflicts
Merge branch 'contrib'