Fixing bugs
Fixed file downloader
Fixed segment request size.
Fixed error in downloader
Fixed error in downloader
changed downloader/sender to send entire file
Modified the download manager to request segments and save them using RandomAccessFiles. Changes also correspond to FileSender using a similar method. Added constructor for FileTracker to read a tracker fiel and instantiate the class with the read values.
Merge pull request #3 from lmnn3/master

merge pull request 3