change json request content type

use correct content type for json requests "application/json", see
RFC4627
Merge pull request #11 from sebastianvogel/dev-json-contenttype

corrected json request content type
Merge branch 'mccrrequestprocessor' of https://github.com/gtxcontentconnector/contentconnector into optimistic-navigation
Merge branch 'mccrrequestprocessor' of https://github.com/gtxcontentconnector/contentconnector into optimistic-navigation
Start the optimistic navigation rp
Implement OptimisticNavigationRequestProcessor with tests
Implement OptimisticNavigationRequestProcessor with tests
Merge conflicts
Add javadocs for OptimisticNavigationRequestProcessor and tests
Add navigation test granularity, check if trees are equal
Add minor changes in javadoc
Move sortCollection method to CRUtils
Fix wrong test database naming
Revome unused logger
Merge branch 'mccrrequestprocessor' of https://github.com/gtxcontentconnector/contentconnector into optimistic-navigation
Revert unnecessary minor changes
Merge pull request #13 from peponesound/optimistic-navigation

Optimistic Navigation Request Processor