compressed file access through rsync needs to be more robust

[blanton144]

Right now the RsyncAccess.add() method appends '*', which catches compressed files but can include other undesired files.

For example the following example downloads the spAll file AND a bunch of the backup files:

import sdss_access
sdss_rsync = sdss_access.RsyncAccess(release='sdsswork', verbose=True)
sdss_rsync.remote()
sdss_rsync.add('spAll', run2d='v6_2_0')
sdss_rsync.set_stream()
sdss_rsync.commit()