tiny log fix in ofSerial
Merge pull request #2518 from armadillu/ofSerialLogMissingSpace

tiny log fix in ofSerial
bug fix - template ofApp needs to extend ofxiOSApp

fixes #2514
Merge pull request #2521 from julapy/ios-fix-ofApp-template

bug fix - template ofApp needs to extend ofxiOSApp
ofGst* separate the setPipeline and startPipeline calls to have more control on the initialization
Update CONTRIBUTE.md with the latest branch structure changes.
CONTRIBUTING.md: Add note about necessitating changelog entries in pull requests.
Reinstate accidentally deleted projectGeneratorSimple (cf. 6e6b145).