#652 - Fix for PP error when SlideShare urls contain querystring params

Brought in the SlideShare module which will take care of the querystring stripping
Temporarily pointing to my (@simong) repo in package.json till the fix
gets merged upstream.
Added a TinCanApi module.

This module is capable of submitting Statements to any
Learning Record Store that follows the experience API/TinCanAPI.
Corrected indention in test-tincanapi.js for consistency
Corrected indention for consistency in oae-tincanapi
fix outdated preview image on activity feed
lock on externalId when creating new users
add test for account creation locking
Fixed issue where the id of the activity object was undefined in case of a discussion,...
Suppressed LRS enabled for end user in oae-tincanapi module
simplify logic flow, fix error message
Updates after code review (except timeout)
Added timeout in config.js for TinCanAPI
Merge branch 'tincanapi' of https://github.com/Coenego/Hilary into tincanapi
TinCan API follow-up
Update README.md to caution about Cassandra 2.0
#663 - Fix intermittent failure when importing users.
#664 - TincanAPI test failure fixes

* Replaced switch-case with if-elseif
* Fixed up unit tests by forcing collection before the tests
add revision back to the content body modified event
add unit test
Renamed `done` callback function in importUsers