Add empty project, cocoapods, cedar tests target
add travis configuration file
update cocoapods before installing dependencies
make schemes shared
travis build script fixed, adding nice badge to celebrate =)
remove unnecessary crap
implemented items addition
add mapping tests.
partially implemented mapping registration and cell/supplementary creation
fix crash, that happens, when headerReferenceSize property is set, and nil returned from supplementary datasource method.

Fix unit tests on mapping.
implemented removing items
implemented item insertion
add iOS 7 support for supplementary views
implemented move items
implemented item replacement
implemented moving and deleting sections