Remove form_block helper. Not required anymore.

  - Use Mojolicious::Validator instead.
  - Stop using "errors" in stash
  - Convos::Core methods return $validation object on error instead of
    error string
Merge remote-tracking branch 'origin/master' into cleanup/form_block

Conflicts:
	lib/Convos/Core.pm
	lib/Convos/User.pm
	templates/event/connection.html.ep
Change formatting and fix typos
Fix $validation->error() usage
Factored out validation rules
Merge pull request #26 from Nordaaker/cleanup/form_block

Remove form_block helper. Not required anymore.