Strict messages fixes #99 and user edit requiring to change password
fixes #67

- Plugins and the user model were throwing strict messages in php 5.4+
or with E_STRICT on php 5.3 and lower. Should be fixed.

- New cakePHP added automatic HTML5 validation to form fields, which
breaks fields that can alternatively be left empty to not be edited
(such as the password field in user edits) - removed the html5 form
validation from user edits.