Added signed statements section & example
Formatting fixes
Added "about" resource
Merge pull request #159 from bscSCORM/about

Added "about" resource
Merge pull request #156 from bscSCORM/sign

Added signed statements section & example
further clarification of targeted statement filter behavior
Merge pull request #161 from bscSCORM/target

further clarification of targeted statement filter behavior
Merge remote branch 'upstream/master' into head_request

Conflicts:
	xAPI.md