Integrated the comments and suggestions of ticket #428 (https://github.com/GeoNode/geonode/issues/428)
Have rewritten the introduction for the installation documentation to better reflect the actuality of how to install Geonode. Also included line by line information how to install for the various platforms.

Formatting on the Windows sections of the tutorial

Further formatting.

Renaming quick install to include other platforms.

A lot of reformatting

Reformatting to be compliant with the Sphinx engine.

Whitespace and return carriage removal

Further formatting
Merge pull request #1437 from markiliffe/master

Multiple platfrom installation documentation