add option to supply additional params to authentication methods
raise excpetion in case of invalid keys
Fixed Instructions for iOS Projects

Added a standard .gitignore for Obj-C projects (https://github.com/github/gitignore)
Moved Copy Headers to Public list (fixed #15)
update README with dependencies
Going to armv7 and armv7s because armv6 is not supported in the dpeloyment target (4.3) anymore anyway.
apply additionalQueryAPrameters everywhere
move copy headers back to project scope
Merge branch 'feature/additionalQueryParams' into develop

Conflicts:
	Sources/OAuth2Client/NXOAuth2Client.m
Merge branch 'bug/iOS-issues' into develop

Undid some WS changes in the README.md and did remove the unnecessary project file changes

Conflicts:
	README.md
bump version to 1.2.2
Merge branch 'release/1.2.2'