Fix typos
Merge pull request #72 from hpique/patch-2

Fix typos
Fix main thread stalling when there was an exception in the responseBlock (especially when using a nil filePath in -[OHHTTPStubsResponse initWithFileAtPath:nil statusCode:… header:…])
Version bump
Fix error when compiling on Xcode 6.0 (so having XCTestExpectation defined) but not targeting OSX 10.10 (OSX.10 SDK not avail in 6.0.1).
-> The conditional compilation was testing the iOS/OSX SDK instead of testing the XCTest Framework version / Xcode Version
Fix main thread stalling (again).
Catching exceptions was not such a good idea. Now when [OHHTTPStubsResponse initWithFileAtPath:statusCode:headers:] is passed a nil filePath, we return an empty body and log some warning. More consistant.