Update README

Fixes missing dependency for jpeg decoder
Merge pull request #1433 from gamesbook/master

Update README
Fix bug #1434
Integrated the comments and suggestions of ticket #428 (https://github.com/GeoNode/geonode/issues/428)
One row header
fixes #637
Merge branch 'master' of github.com:GeoNode/geonode
Merge pull request #1436 from ppasq/templates

One row header
Merge pull request #1435 from nastasi-oq/master

Fix bug #1434
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
added Join Group button for joining public groups
Merge branch 'master' of https://github.com/sbsimo/geonode
Merge pull request #1438 from sbsimo/master

added Join Group button on the Group Detail Page
Added virtualbox instructions
VMware instructions.

Added VMware instructions fixes https://github.com/GeoNode/geonode/issues/1159
References the quick installation docs
Referenced the new name for custom installation
Referenced the new name for custom installation
Merge pull request #1439 from markiliffe/master

Preparing your environment documentation