* Added a new table 'mib' with 'data', 'size' and 'method' columns
* added AddMIB() function and test case TestMIBHappyPath()
* added function and a test case to add entries into bandwidth usage table
* added functionality to create an entry, update the entry and readback the entry based on a given date into/from bandwidth tbl
* added initial SumBandwidthSizes()
* added the functionality to retrieve the total bw usage based on start and end date
* Added the unit test case for AddBwUsageTbl
* changed the arguments to take time format as arg than Unix format
* changed the arguments to take time format as arg than Unix format
* changes per code review comments
* adding back go.sum
* changes per code review comments
* changes per code review comments
* changes per code review comments
* Limit to only 1 database write
* Check file system rather than database
* Move check to storefile. We need to figure out how to fix this mess
* piecestore should not overwrite data, it should fail when trying to write to a file that already exists
* Format errors, delete unused function in psdb for checking if TTL exists
* Combine errors better
* captplanet standalone farmer setup
* Bandwidth Allocation
* utils.Close method changed to utils.LogClose
* Get build temporarily working
* Get/Put for PSClient should take payer bandwidth allocations rather than the NewPSClient function
* Update example client to reflect changes in client API
* Update ecclient to use latest PSClient, Make NewPSClient return error also
* Updated pieceranger tests to check for errors; sign method should take byte array
* Handle defers in store.go better
* Fix defer functions in psdb.go
* fun times
* Protobuf bandwidthallocation data is now a byte array
* Remove psservice package and merge it into pstore server
* Write wrapper for database calls
* Change all expiration names in protobuf to be more informative; add defer in retrieve; remove old comment
* Make PSDB tests implementation independent rather than method independent
* get rid of payer, renter in ecclient
* add context monitoring in store and retrieve
