Allow a different user model to be plugged in.

The use model is set in config. Default is the Brightcontent::AdminUser
model.
Add user model to generated config.

Provide some docs and a commented out user_model setting in config.
a hook to put things at the bottom of a <body/>

The intended use is to give apps a way to insert script tags as late as
possible.
put the model name in an html-class attribute

Something like this is badly needed if you want to style certain columns
of certain tables.
filters bugfix, improve spec
use #dom_class to generate html-class attr.

As @jvdp proposed.
Merge pull request #45 from tijn/annotate-tables

Put the model name in an html-class attribute of the list table
Merge pull request #44 from tijn/bottom-hook

a hook to put things at the bottom of a <body/>
fix formatting in readme
Fix two typos.
Use proper spelling of geüpdatet
Merge pull request #48 from tomkr/typos

Fix some typos in the Dutch translations.
Let Rails upgrade to 4.1. Fixes #35
Merge pull request #49 from stefanroex/rails41

Let Rails upgrade to 4.1. Fixes #35
Read version from correct location
Add descriptions to rake tasks
Merge pull request #41 from tomkr/custom-user

Allow a custom user model
fixate some dependencies
default file form field layout
badges for the main repo