Added ADL xAPI wrapper submodule
Added dummy module ready to fill with xapi stuff
Skeleton integration of module with scene
Added placeholders for wrapper functionality
Simplified boilerplate
More cleanup
Merge branch 'development' into 'xapi-kit'

Conflicts:
	support/client/lib/index.html
Fixed scoping issues
Continued experimentation, updated XAPIWrapper
Added automatic pivotal tracking of branch

[#56896806]
Fixed params typo, added single-client xhr propagation

[#56896806]
Rearranged xhr callback

[#56896806]
Fixed number of arguments for each method

[#56896806]
Fixed linux compatibility issue with the datafile API

[#56896806]
Cannot post statements from system-generated events

[#56896806]
Cleaned up some log messages

[#56896806]
Merge branch 'xapi-kit' into development

Conflicts:
	support/client/lib/boot.js