Converted media Interface to use streams (Java IO) instead of byte buffers of

Converted media Interface to use streams (Java IO) instead of byte buffers of
the entire uplaoded files. These saves loads of unecessary memory use. JAI
still consumes quite a bit though.

A new temporary file (for JAI) parameter is necessary and is in the config.properties file.

A nice side effect of this work is the FileHandler interface which is
basically a call back mechanism for WebdbMultipartRequest which allows the
uploaded file to handled by different classes. For example, for a media
upload, the content-type, etc.. needs to be determined, but if say the
FileEditor had a feature to upload static files... another handler wood be
needed. Right now only the MediaRequest handler exists.