Add maintainers, license, and contributing instructions

Closes #4
Merge pull request #6 from dmcgowan/create_community_files

Add maintainers, license, and contributing instructions
Update stream open and replies

Separating create and open allows for easier avoidance of race conditions between saving a stream reference and receiving a reply.
Replies are now controlled by the handlers instead of automatically sending after a stream frame.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Fix race conditions accessing stream map and framer

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Update readme example
Add frame handling priority

Closes #7

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Merge pull request #9 from dmcgowan/fix_race_conditions

Fix race conditions
Merge pull request #10 from dmcgowan/add_priority

Add frame handling priority
Remove stream open function to restore create interface

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Merge pull request #12 from dmcgowan/remove_stream_open

Remove stream open function