moving generic HTML5 form functionality to Skull.Form
created Skull.TimedInput mixin to use the timedKeyup events in views with inputs as root el
Created skull view for project form and for permalink input. User  mixins to validate both. Check slug using the default project_by_slug_path. Put permalink pattern in pattern attribute to validate using HTML5 form validation.
removed check_slug from projects controller and routes since we now check the availability of a slug through a direct access to that route
Merge pull request #234 from diogob/improving_new_project_form

Improving new project form