Version bump for JS tracker.
Added TODO list
Fixed document reference to use documentAlias (#247)
Added test of setCustomUrl
Fixed bug with setCustomUrl - #267
Actually setCustomUrl was working - the problem was that the
url being passed to collector was not being set from currentUrl.
Changed ev_ to se_ for structured events (#197)
Tidied up event names passed into getRequest
Clarified unsure when this version will be released
Updated Readme.md to list the data stores and expand range of analytics tools
Update README.md
Fixed indentation issue in :jobflow:
Updated CHANGELOG
Merge branch 'master' into feature/js-improve

Conflicts:
	CHANGELOG
Fixed
Added git submodule link for Snowplow Lua Tracker (#292)
292 now done
Fixed Firefox security errors with sessionStorage and localStorage (#163)
Fixed page ping bug where pageXOffset and pageYOffset were incorrectly being used directly (#260)
Replaced forEach as not supported in IE 6-8 (#295)
Bumped to 0.12.0
Fixed on today's date