gray-crawler: adding bitarray to core code
gray-crawler: adding bitarray to core code

+ bitarray needs global knowledge from all file systems etc.
+ renamed partition_entry to more descriptive fsdata
+ added helper cleanup function upon error (deduplucating code)

wenluhu/gammaray-android,cmusatyalab/gammaray,cmusatyalab/gammaray,wenluhu/gammaray-android,cmusatyalab/gammaray,wenluhu/gammaray-android