Added code to allow for variable length node.  At node creation the user should specify parts=unknown.  Successive parts must be added in order (1, 2, 3, etc.).  The final part should be identified as part=last.
Edits to new feature to allow variable-length nodes. Parts can now be added in non-sequential order and instead of having a part named 'last', the user should send a form with a 'close' parameter to close the node. Node creation in this manner will allow missing parts when node is closed. Also, added deletion of 'parts' directory when node is finished being created from parts.
Changed temporary filenames of parts from 0...N-1 to 1...N
Better error handling and removed a couple debug print commands
Merge pull request #92 from jaredbischof/master

Added code to allow for variable length node.