updated anchor "color" link
made class icons a bit smaller
corrected typo

“while” to “white”
added period to the end of typography paragraph.
Merge pull request #173 from masondesu/eric

added a promotional page for the Houston Public Library event
Merge pull request #174 from masondesu/eric

added a mailing list URL
Updated Sample files
Added Callout Hues
Merge pull request #175 from natespain/standards-guide

Standards guide updates
added icons for the accelerator page