Move opening curly brace for multi-line function prototypes
Move opening curly brace for multi-line function prototypes

Moving the curly brace onto a new line for multi-line function prototypes is consisent with Xcode's expectations (the re-indent feature works properly). This is also consistent with other open-source Swift projects.

tad-iizuka/swift-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,tad-iizuka/swift-sdk,tad-iizuka/swift-sdk,watson-developer-cloud/ios-sdk,tad-iizuka/swift-sdk,tad-iizuka/swift-sdk,watson-developer-cloud/ios-sdk