First pass at leadership cal pdf.
Adds filters to download section. Needs to update blog and newsroom filter snow though.
Code cleanup.
Refactored filters to use unique ids and refactored calling of the input split js.
Updates newsroom and blog to use updated filters macro.
Fixes merge conflicts.
References example pages int he filters macros notes.
Updated filter macro notes.
Remove fallback for print footer.gs
Fixes formatting.
Remove fallback for print footer.
Fixes date range validation.
Fixes a merge conflict whoopsie.
Removes the html.html weird thingy.
Fixes merge conflict.
Merge pull request #193 from himedlooff/gh-pages

Leadership calendar PDF