python instructions and added erlang instructions
added sudo to install marvel
Description for installing rabbitmq on ubuntu

rabbitmq 3.2.4-1 is included in ubuntu repos, use invoce-rc.d to start
Added mongodb instructions for deb systems
Added blank line to proper heading
Added new line below to get proper heading
new line again
Instructions for installing nginx on apt-get based system.
adding untar command to uwsgi in install document.
Fixing format error in installation documentation.
Merge pull request #110 from BjornArnelid/master

Closes #81