Start a branch for Swift 2.3 [skip ci]
Start a branch for Swift 2.3 [skip ci]

adonoho/XCGLogger,DaveWoodCom/XCGLogger,mottx/XCGLogger,mottx/XCGLogger,cwoloszynski/XCGLogger,DaveWoodCom/XCGLogger,pollarm/XCGLogger,pollarm/XCGLogger,adonoho/XCGLogger,cwoloszynski/XCGLogger