Merge pull request #365 from ptiz/master

Fix for hanging web cache in multithreaded environment #364
Enabling unreachable code check in Xcode 6
Removing unused link to SenTestingKit
Updating podspec to 1.4.0-beta version
Fixing ROADCore wrong inheritance of header search paths property
Fixing logging and cache context.
Updating podspec to 1.4.0-beta2 version