Style changes

Increasing header/footer width to 1170px
Increasing base font size to 16px, from Springshare's default 12px
Adjusting spacing around the libraries and MIT logos in the header
Minor adjustments

Switching "&" to "&amp;" in footer content, and indenting change on the
header
Throwaway commit

Not sure what happened to custom-head, but the diff is too large to show
- rebuilding the file, but this is the diff where everything got messed
up
Fixing custom-head

This de-minifies all the css styles in custom-head
Implementing simple footer responsiveness
Adding Remlee's styling edits
Overriding accordion styling, s-lib-box-content change
Style adjustments, undoing ampersands

Style/layout changes per Remlee, and switching the collapsible arrows
over to images served from libraries.mit.edu rather than characters
(which bring underlines and other ugliness)
Adding specific font weights to Open Sans
Adding padding to table elements
Merge pull request #4 from matt-bernhardt/libguides-v2

Catching up with changes