Merge branch 'release/0.2.0' into develop
fix(travis): set fix cocoapods version

also point to the current development version in the readme
Merge pull request #9 from Hotel-Reservation-Service/feature/travis

fix(travis): set fix cocoapods version
fix(section): make sure coordinator of a section controller is nilled properly

This fix ensures that the section coordinator is only nilled on section controllers that are not needed anymore. This fixes an error that occurred when setting a new array of section controllers that partly matches the old section controller array. In this case, the old section controllers were not linked with the section coordinator anymore.
refactor(coordinator): optimize setSectionController:

optimise the performance as well as the readability of the method.
chore(project): update project structure by Xcode
fix(mapping): properly handle nil index paths

ensure that the index path mapper returns a nil index path if a nil index path is passed to one of the mapping methods `-dynamicIndexPathForStaticIndexPath:` or `-staticIndexPathForDynamicIndexPath:`
Merge pull request #10 from Hotel-Reservation-Service/feature/fix-index-path-mapper-nil-index-path

fix(mapping): properly handle nil index paths
Merge pull request #11 from Hotel-Reservation-Service/feature/fix-section-controller-becomes-nil

Feature/fix section controller becomes nil
chore(bump): set version to 0.2.1
docs(changelog): update changelog for v0.2.1
Merge branch 'release/0.2.1'