NEW: unit test for WarcResource.
FEATURE: support replaying from metadata and resource records.
  initial work. resource record support may need further work.
FIX: WARC Date header is in ISOZ format, not DT14.
CLEANUP: separated out test support classes in WarcResourceTest into
org.archie.io.warc package.
image metadata record works okay, not tested with ftp resource records.
old-style revisit and ftp resource revisit still do not work.
Merge branch 'topic/non-response-support'
FIX: robot filter test to reflect fix in robots.. (check with www first if present in url, otherwise check first w/o)