Don't show security dialog if validator is available.
Fixed an incorrect error description.
Implemented Base.toString() to improve error reporting.
Delay internal release operations until worker threads have finished (issue #62).
Increased max Firefox version to 31.
Reverted commit 1884ccb (Base.toString) due to regression.
Improved IMAGE_FORMAT_NOT_SUPPORTED error description in WebCLContext.createImage.
Fixed invalid argument handling in WebCLValidatedProgram.createKernelsInProgram.
Fixed invalid argument handling in WebCLValidatedProgram.build.