Speed up installation of nokogiri (html-proofer dep)

... by setting NOKOGIRI_USE_SYSTEM_LIBRARIES=true. Way faster on travis.
Merge pull request #117 from parkr/nokogiri-speedup

Speed up installation of nokogiri (html-proofer dep)
remove sexybookmarks
fix cfpb source code policy link
fix wired link
streamline bio
add in open data policy
Merge branch 'master' into open-to-collaborative