Updated supported versions to include R15.
Merge pull request #4 from pmembrey/master

Updated rebar.config to indicate support for R15
Update rebar executable.
Update deprecated options in rebar.config.
Merge pull request #5 from kellymclaughlin/update-deprecated-rebar-opts

Update rebar and deprecated rebar opts
Merge remote-tracking branch 'remotes/upstream/master'

Conflicts:
	rebar.config
Add R16.