Merge branch 'release/0.4.4'
* release/0.4.4:
rockspecs: adds 0.4.4 rockspec
docs: update CHANGELOG with pending release date
docs: update CHANGELOG
docs: update copyright dates
travis: update to use hererocks for version management
travis: synchronizes with moteus/lua-travis-example to fix LuaJIT builds
event_callback: handle 0 timeout properly
build: allow all branches to trigger builds
build: allows 5.3-dev branch
headers: updates Lua 5.2 workaround to allow 5.3 version
travis: prepares travis-CI build
test: updates buffer tests to work with busted which works with Lua 5.2