Nav, user display size enforce and alignment.

The avatar is now fixed to an acceptable size, which is enforced on the
rendering level, rather than by the actual image. Also fixed the
alignment issues.
Update simple_form to 2.1.

The reason for this is that, after doing some research, it seems that
TB is not completely supported out of the box by the older versions,
making it hard for me to implement some needed things.
Implements Fixes to TB for simple_form
Simple Form Fixes for Form Actions
Merge branch 'develop' of github.com:amooma/GS5 into develop