fixes #36, stop archive URI was incorrect
add license file and remove extraneous headers from source files
adds contribution guidelines
adds developer guidlines, still incomplete
Merge branch 'jeffswartz-v2.2-docs' into aoberoi-modernization

Conflicts:
	src/main/java/com/opentok/TokenOptions.java
documentation generation tasks
change p2p to media mode
Adding docs for the MediaMode enum and setting.