Version 1.0.2 (2016-06-20)

Bunch of changes from reviews
item_get_parent now returns sbitem, not just ID
fixed probablem with query_sb_doi
query_sb_spatial no longer has awkard bounding box specification,
just uses lat/long arrays and determines box from those
sb_ping returns boolean TRUE/FALSE for success/fail
set_endpoint no longer includes verbose message and properly uses match.arg
item_list_children now returns list of sbitem to be uniform with rest of sbtools
Lots of documentation updates and new demos

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