added n:n relation between accounts-contacts
eliminated bugs which occured due to newly introduced n:n relation
fixed tests
cleanups in import
cleanups
merged with import-extensions
merged with develop
adapted import to new contact-account relation
cleanups
fixed tests
fixed possible issue in foreach
Merge pull request #99 from sulu-cmf/feature/accountContact-relation

[FEATURE] n:n relation between accounts and contacts