disqus work
* fix #309
sanize disqus input
* uses the textilze filter to sanitize blog post title
* I'm worried you may lose older comments since this actually changes the title
** wasn't able to load comments locally at all (even without changing title) so I suspect disqus is storing comments on the url when no identifier is set
Should fix #300:
1. Modifying preprocessor so that every bootcamp entry in _config.yml always has a URL field.
2. Modifying other code to always rely on this.
Post about Cambridge R bootcamp
Merge pull request #310 from acabunoc/redesign

disqus work
Typos and other corrections
Blog post about URI bootcamp
Merge pull request #313 from gvwilson/blog-uri-bootcamp

Blog post about URI bootcamp
Fixing typo. Should be ready to publish now
Merge pull request #312 from apawlik/postCambridgeR

Post about Cambridge R bootcamp
Fixing up blog post about Cambridge R bootcamp
Merge pull request #314 from gvwilson/blog-cambridge-r-bootcamp

Fixing up blog post about Cambridge R bootcamp
Fixing capitalization in title
Merge pull request #311 from gvwilson/fixing-bootcamp-urls

Should fix #300: bad bootcamp URLs in calendar.
Navbar work
* mostly the collapsed the bar, make less awkward
* some link colour changes