Changes to fix embedded github gist compatability!

* Added _gist.scss to define and clear styles for embedded gists
* Added gist partial to main.scss
* Changed "line" to "menuline" to avoid conflict with embedded gists
* Updated navigation-sliding.html to use "menulines"
Merge pull request #1 from satyamsatyarthi/master

Changes to fix embedded github gist compatability!
Add scrollbars to wide code blocks
Do not display breadcrumbs on empty categories
Merge pull request #9 from katafrakt/breadcrumbs_fix

Do not display breadcrumbs on empty categories
Move empty category check inside breadcrumb include
- Reduce repetition. Cleaner include.
Add microdate markup for breadcrumb rich snippets
Roll back gems to fix Windows problems
rel="nofollow" footer links
Add bottom margin to .highlight
Update gemfile
Fix home linke path