Add nbsp to avoid minification issue in beta header

The br meant the minifier was stripping too much whitespace when the
br was display: none.
Stoping published:false articles from hitting the landing page
Merge branch 'master' of github.com:google/WebFundamentals
Fixes #341 - makes sure the correct link is generated on the developers.google.com/ build
Update use-request-auto-complete.markdown

#342
import image optimization content
drop "public" from cache-control (thats the default)
cleanup and stage image article
drop analytics footer as it skews perf profiling
cleanup CRP content

- drop commented out TOC's
- add TOCs to articles that have multiple sections
- drop &nbsp hack
fix images in CRP perf patterns
escape comments, fixes #339
fix image link, closes #86
layout shows hello world trace, closes #338
Merge branch 'develop'

* develop:
  removed breadcrumb on getting started page
  fixed a lot of minor issues causing the baseline to break and some elements not being in the grid
  merged master
Merged develop and generating new font icons
Grunt build
Merged master and grunt build