Revert "Use correct CSS3 linear-gradient syntax."

This reverts commit 1e1b1556d8ec7ac989f4e65650741ffd48d2c3c2.
Use the correct W3C syntax for linear-gradients.
See #392.
Fix CSS validation for various properties
Remove opacity hacks that were supposed to fix Windows font rendering
These hacks had little success and the webkit-font-stroke made rendering
on Windows Chrome look horrible.
Merge branch 'develop' of github.com:unl/wdntemplates into develop