added Relation entity for addresses; added main-email,url,fax,phone to account and contact for flat representation
handling of main relations in contactcontroller
added more advanced address handling
added relations to flat list api; corrected default fields
introduced ContactManager for handling contact specific tasks
set primary address of address entity based on relation; test fixes
fixed bug in type filtering
cleanups and bugfixes
fixed account-tests; cleanups; bugfixes
fixes in contact-tests; removing addresses when no relation left
enabled partial load when loading addresses with findbyid
updated import: make use of manager; performed changes in manager
set current position
merged conflicts
added build files
Merge pull request #116 from sulu-cmf/feature/flat-relational-data

[FEATURE] flat representation of account / contact main-relations