Finished the file downloading class, file sending class, and file sender manager. Added corresponding functionality to peer class to download and send files.
Added data folder for config
Merge branch 'master' of https://github.com/vmkf5/CS5600
Fixed MD5 calculation of initial files, added test main function.
Added functionality to save and delete trackers to/from the local cache. Added better support for determining the local site IP address of the host computer instead of getting the localhost address.
Merge pull request #2 from lmnn3/master

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