Fix #47 - Add client-side validation to most relevant forms

This pull request integrates Parsely independent of the backend framework. The amount of logic-duplication is IMHO minimal and should be negligible. Supported are following forms:

* login
* change password
* reset password
* change profile
* registration
* proposal submission
* review form
* review-comment form
* proposal update form (review system)

These should be the most relevant forms right now and it is extremely simple to add client-side validation to other forms later on.

To test, you have to update the external requirements using bower:

```
$ cd pyconde/skins/ep14/static/assets && ../../../../../node_modules/bower/bin/bower install
```