removed context from being mandatory
added regex for xapi version
added about endpoint and changed act def url field to moreinfo
merged master-has about, moreInfo, and versioning
Merge pull request #139 from ljwolford/1.0context

1.0context
initial commit to add http HEAD
added content length to agents and activities endpoints
Merge pull request #140 from ljwolford/1.0head

1.0head
merge of 1.0dev
added objectType test to agent