renamed Error to Err in fake compressor

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
formatting

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
delete compressed compiled package after it is uploaded to blobstore

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
added CleanUp to compressor

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>
use compressor CleanUp instead of RemoveAll in concrete compiler

Signed-off-by: dmitriy kalinin <dmitriy@pivotallabs.com>