#392: CSS in application.css ignored.

Updating documentation to explain how to implement custom.css (and custom.js).
Bumped Ruby Version
Command to quickly configure ...
Merge pull request #393 from sepastian/master

Explain how to use custom.css and custom.js in the docs
Use placehoder- and value-param for #quicksearch

This solves the bug that causes your search team to disappear once you
try to specifiy or change the search term.
Show what is searched in #quicksearch

This certainly is more of a proof of concept since the implimentation
is quite hacky. But I really think there should be some information
about what is searched once you search…
Merge pull request #396 from tordans/master

Use placeholder- and value-attribute for #quicksearch
Merge remote-tracking branch 'fesplugas/master' into betterplace