Readme file added.
Draft version of Cytoscape 3 release page.
Modified for final release.  Fonts are tweaked.
Updated release note page layout.
Merge branch 'feature/cy3-html5' into develop
Minor typo/errors are fixed.  And title image updated.
Welcome Letter updated.
Release notes updated for the Mac installler problem.
Image files for release notes added.
"issues" tag added for the known issues section.
Windows XP issue updated.
Welcome Letter updated.
Welcome Letter file name updated.
Top page had been updated for 3.0.0 release.
Menu bar rendering problem on Firefox had been fixed.
Header design modified for home page.
Broken links are fixed.
README file updated.
Bug Bounty Program updated.
Typo fixed.  Also, link to issues section added for Mountain Lion users.