Rakefile option for any additional rsync arguments

Added variable `rsync_args`
Initial Setup for snhack.github.com
Blog and Rakefile configuration
Minimal grey theme with standard sans-serif
Add header logo and centre title text
Add google-site-verification
Add links to navigation header
About page: Add general info for new members
Navigation improvements for mobile browser
Add README.md for static master branch
Lighter background and no header border

- also set navigation link colour
Add rss subscription to main nav items
Add logo as background and adjust title size
Adjust navigation font size and margins
Use Droid Sans as header and main font