Added informations about gluon versions to getting started

Community name change from Freifunk Oldenburg to Freifunk Nordwest

mpc85xx and x86 are unchanged since rc3.

gluon changes

gluon changes

Mainz/ Wiesbaden: url and community name changed

The community has been renamed from Oldenburg (ffol) to Nordwest (ffnw) to include other cities. Also the git url has changed.

Update site.rst

Added Braunschweig to site-repos in the wild

Just corrected a typo

Delete builds.rst

This chapter is no longer needed (duplicate content).
The content is alrady in http://gluon.readthedocs.org/en/latest/user/getting_started.html#getting-started .

Update getting_started.rst

Updating OpenWrt accidentally enabled this option.

This chapter is no longer needed (duplicate content).
The content is alrady in http://gluon.readthedocs.org/en/latest/user/getting_started.html#getting-started .

add information about the environment variables.

This significantly improves fastd performance, to the level it was before
Barrier Breaker.