Changed Button Radius

This change is not SCSS but I hope to find the right place to update
this in the next pass.
Add Gradient to HP Git Button
Fix Alignment of Github Icon on Home "Start Coding" button
Remove Stray H2 above Git button

Also added a new class and gave it some top margin.
Add box shadow to all buttons
Add gradient to default button, removed border
Add hover gradient to default button
Add text-shadow on all button text
Add gradient to "Get Started" button
Merge branch 'launch_design' of git://github.com/bmartinstudio/codemontage-1 into launch_design