Mobile search layout fix

Moves mobile search into red navigation bar at nav-hidden widths. This
allows more space for site titles. I've also updated the plaeholder
text. Bob, Aaron, and I discussed this and felt the current placeholder
text could be worded better.
Mobile search fix

Centered search field
fix conflicts
Remove menu-toggle pointer

This also moves the hamburger icon down one pixel for better vertical
alignment
Remove unnecessary CSS

Addresses Kevin's comments
Additional updates to address Kevin's comments

Turns out the input field was 170px, not #wdn_search_form. I made some
further adjustments, but will argue that the red bar itself serves as a
good container for the search; no need to add additional visual noise.
Move the favicon varients into the include folder for server mirrors
Related to #645
Merge branch 'RD-Updates' of https://github.com/skoolbus39/wdntemplates into rdee
Improve resource rendering by removing unused padding at baseline
Remove text-rendering property and implement legacy CSS calc fix

Our webfonts will not require any special text-rendering
adjustments and the stock Android <4.4 browser breaks fonts with
it.

Also provide a CSS calc shim to improve Android rendering.
Closes #651
Merge pull request #650 from skoolbus39/RD-Updates
Mobile search layout fix