Add files received via PUT to the async queue.
remove trailing whitespace
Setup framework for custom handlers

This commit makes it easier to handle new types of submissions
using the new PUT method of submitting arbitrary files to CDash.
enable custom handlers for synchronous submits
Check MD5 sum on PUT submission
include buildid in temp filename of PUT submission

This should make it less likely that files are overwritten
while waiting to be processed.
Backup files submitting via PUT

Also make sure that PUT submissions trigger the asynchronous
processing loop.
Merge pull request #9 from Kitware/custom_submit_handlers

Support custom submit handlers in CDash