refactor(core): simplify amazonia
refactor(core): micro line optimization
refactor(gen): switch to ng-annotate

Closes #17.
refactor(gen): improve gulpfile
fix(gen): deps and watch js files
Merge pull request #16 from meriadec/develop

refactor(core): improve code style
fix(core): reload dist files from #16
docs(core): add some precisions for contributon
test(e2e): link to new open sauce account
docs(tests): add badge and link to sauce tests
chore(core): bump to 2.3.1
Merge branch 'release/2.3.1'