Update composer.json
Merge branch 'develop'

Conflicts:
	composer.json
added parent to row to array
Merge branch 'develop'
added testcase
fixed list-to-tree function
fixed min depth
fixed root node
removed 'root'
added 'root'
added test case without root
fixed sulu-cmf/sulu-standard#299
fixed sulu-cmf/sulu-standard#260
fixed excerpt data loading
cleaned code
Merge branch 'hotfix/excerpt' into develop
Merge branch 'hotfix/list-to-tree' into develop
Merge branch 'hotfix/rss-startpage' into develop
Making MassiveBuild an optional dependency
Merge branch 'bugfix/massive-build-is-hard-dep' into develop