adding reformatted install.html and README.md links to HTML documents (relying on htmlpreview functionality)
bugfix: in each branch README.md will have to refer to its own version of docs
Doc update to please Doxygen

Doxygen doesn't like when a =head2 section is not linked to a method.
We had to move the comments to #-prefixed lines.
Include the CSS for the eHive HTML doc

The CSS file is a copy from 00_general.css (in ensembl-webcode).
Variables have been replaced, and a few tweaks have been made:
 - global padding on <body>
 - font-size in the th/td elements
typo
Added docs/index.html and use rawgit in README.md
Added scripts documentation
Added the Doxygen documentation
Merge branch 'version/1.9' into version/2.0

* version/1.9:
  Added the Doxygen documentation
  Added scripts documentation
  Added docs/index.html and use rawgit in README.md
  typo
  Include the CSS for the eHive HTML doc
  Doc update to please Doxygen
  bugfix: in each branch README.md will have to refer to its own version of docs
  adding reformatted install.html and README.md links to HTML documents (relying on htmlpreview functionality)
Updated the Doxygen doc for 2.0
Updated the installation guide for 2.0