Added 48 hour timeout for reading and writing to Shock.
Added size index to nodes that are created by importing from a local file path.
Added code to ensure that Shock checks for index existence in mongo before looking for path to index file.
Merge
Merge pull request #158 from jaredbischof/master

Added timeout, checking for indexes in mongo, and creating size index for files imported from local file.
Added option to download file by given seek and length position.  Omitting seek assumes seek=0.  Omitting length assumes that you want the remainder of the file.
Merge
Merge pull request #159 from jaredbischof/master

Added option to download file by given seek and length position.
fixed conflict