fix return value issue in isFileChunkingSupported util func
#680 - start of supported features flags
#680 - start of supported features flags - adjustments to initial approach
#680 - feature detection module readme, add more feature to detection list, add "unsupported" message when using FU mode when uploading not supported.  TODO: Don't wait for window.onload before initializing qq.supportedFeatures.
#680 - remove dependency on window.onload.  TODO: test in real IOS5 device
#680 - remove dependency on window.onload - updated associated readme.  TODO: test in real IOS5 device
#680 - finish features flags, use flags internally where appropriate
#680 - link to readme page for new supported features module throughout the documentation
Merge branch 'supported-features-flags' into 3.5-IP