did pep8 and pyflakes on codes
fixed vo.server.validate logic
fixed vo.server validator on cached data
applied PR #478 from @mdboom and fixed network_error KeyError on cached data
added note to vo.server validate doc
fixed vos_catalog bug not recognizing SR in wrong case
added search by URL in vos_catalog and updated doc
updated conesearch doc and tests
this was commit ce9d5ba
a fix by someone else to clear download cache
added r._attributes to JSON, removed conesearch.json
fixed list_catalog bug for empty list
fixed vos_catalog parsing bug when no SR given
fixed validate bug not catching network error in cached data
fixed vo validate cfg def
improved vo list_catalog matching
vo server now clears python warnings before each validation
added server examples and changed default master list
created
fixed circular dependencies for reset_vo_warnings