Change documentation to Markdown

First attempt with FAQ.md

issue#40
Some markdown changes in FAQ
Removed mail reference in favour of Github.
Changed README to Markdown syntax
Changed CHANGELOG to markdown syntax

Also removed old changelogs with reference to the archives on wikibooks
Changed INSTALL file to markdown syntax

Issue#40
Changed REQUIREMENTS.md to markdown syntax
Modified lists in REQUIREMENTS

issue#40
Updates in markdown syntax for UPGRADE.md

Added some lists (*) to make layout look better on Github site.

Issue#40
Merge branch 'issue#40'

Completed changing documentation to markdown syntax.

Fixes #40