Dfoxpowell/add linkpaths, responsive layout changes, css cleanup

missing links:
-mobile
-ab-testing
-split-testing
-resources
----mulitvariate testing
----multivariate-test-vs-ab-test

Added linkPath to various templates

Made handlebars helper to determine if passed in yaml is an external URL or relative path that would need linkPath appended

Free trial page needs some love??

Fixed responsive issues with various pages and fixed footer layout