Add composer.json to support installing with composer. Fixes #4776
Merge pull request #52 from ingenerator/3.3/feature/4776/composer-package-definition

3.3/feature/4776/composer package definition (refs #4776)
Update composer branch alias (refs #4776)
Merge branch '3.3/develop' into 3.4/develop
now alias without prefix
Merge branch 'upstream/3.4/develop' into 3.4/develop