Remove github from the navigation

Remove github from navigation bar as it will be near the footer as an icon.
Update Font Awesome to 4.0.3
Add font awesome icons to footer.
Style icons in footer
Add blue links font color variable
Use rgba sass mixin to lighten the color on hover

Light color on anchor hover with the rgba sass mixin.
Remove breaks and add paragraphs in footer

Remove breaks and add paragraphs to the footer text.
Add a center elements in div class
Add centered text to the footer remove occurrences

text aligned center in the footer.