use https
use proplist as message
allow structured gcm message
rename mochijosn2 to avoid confliction
delete
new rebar version
change mochijson2 to jsx, use lager instead of io:format, add tests and callback for error handling
update README
Merge pull request #1 from bosqueviejo/master

Enhacements
Improving tests using fixtures
Fixing tests
fixing bugs
fixing issue #2
improved README file
General refactoring of tests
Updated tests
Fixed error in README.md
Introducing CI with Travis
Modified .travis.yml file
Modified .travis.yml file