Update with content from releng's paper

updated grunt for prod target to work with multiple pages
Merge branch 'master' of github.com:buildbot/buildbot-website
minor text improvments:

- remove reference to the "paper"

- add statement about buildbot config being shareable via scm.

Signed-off-by: Pierre Tardy <pierre.tardy@intel.com>
add responsive support

The website is now nice on phones and tablets.

Signed-off-by: Pierre Tardy <pierre.tardy@intel.com>
rewrite much of basics.html to suit the needs of the site
finish up text for the main three description pages
remove unnecessary sub-pages
Merge pull request #3 from djmitche/tardyp-text

Text rewrite
remove unusd file
simplify jade, shrink the jumbotron
fix nesting of head elements, footer script
move all descriptive content into index
Merge branch 'master' of github.com:buildbot/buildbot-website
fix some coffeLint warnings
new layout with main content on single page, plus about and contact pages