Add favicon based on public domain source.

Just something so that you can see which tab is running pipeline.

http://openclipart.org/detail/28804/a-green-cartoon-pipe-by-purzen
Add todo
Remove secret key base from the app.

Not a great idea to have that in an open source rails app.
Some documentation for ENVs
Fix rails 4 deprication
Fixing remaining deprications
Heroku instructions for SECRET_KEY_BASE
Update todo.

I can't run ruby 2.1 with rvm on my old osx simply so letting it be 1.9
for a little while longer.
Unbreak assets on heroku
Unbreak some more :)
Cleanup of ENVs