[#25] First attempt
[#25] facepalm
[#25] No need for lager
[#25] Using sandbox for tests
Merge pull request #25 from inaka/elbrujohalcon.25.make_compatible_with_erlang_mk

make compatible with erlang.mk
support priority in apns notifications
Priority is encoded as a byte
add test case for low priority alerts
rebase to master