Updated Grunt.JS settings

Removed the imagemin task because it was causing errors and is
unnecessary.
Updated index.html with content and title changes

Updated index.html with content changes and new title format.
Updated nav styles to flow with content

Updated nav styles to flow better with content, added fancy top bar,
added a:hover styles.
Moved site color, updated fonts and width

Moved site background color variable to _vars.sass, updated nav and
header fonts, renamed and updated body width.
Updated _fonts.sass to include more weights

Updated _fonts.sass to include more weights of Source Sans Pro from
Google Fonts.
Cleaned up _main.sass, added selection styling

Cleaned up _main.sass and added styling for selection.