Reload image on load or error instead of regular intervals
1. Memory leak due to caching functions and functions exit with error. Workaround by handling exceptions within the function.
2. Caching cause Image element to update slowly. Disable caching until further workaround is found.
Added jiawang's camera support files. The module has functionalitis to return an image when a function is called. There are two versions: a threaded version where capturing is async to sending data. and the normal sync version.
Added entry in the cluster to support jiawang's pi with webcam