Merge pull request #1 from yeastgenome/updated-convert-process

Added perfconvert to convert process.
Added logging to sgdbackend and perfbackend. Need to monitor performance.
Cleaned up perfbackend/sgdbackend/backend divide.
Added TestBackend to be used for testing the frontend or when the dbs are down.
Small change to backend_interface.
Implemented final conversion process pastry -> master -> db1 -> db2.