Tangelo tags for navbar.
Merge branch 'master' into tangelo-js

Getting fix from fix-jquery-include.
Clarifying structure of flickr HTML page with comments.
Adding comments and clarifying structure of ner app page.
Styling ner app to use Tangelo primitives.

Removing hard-coded config callback name - user is now free to install a
callback themselves on the button with id "tangelo-config-submit".
Merge branch 'tangelo-js'
Fixes to the configuration process for tangelo script.
Merge branch 'tangelo-fix'
Adding support for per-user web directories.
More robust handling of user web dirs.

Also added trailing slash redirection.
Merge branch 'per-user-dirs'
Removed hard dependency of tangelo on bson module (from pymongo).
Merge branch 'no-bson'