Merge pull request #1 from kwilcox/master

Don't reprocess a URL if we have already seen it
Update __init__.py
Bump to 0.7-dev
Merge pull request #2 from kwilcox/master

Add additional parameters to ISO related services
Merge pull request #3 from kwilcox/master

Better handling of sketchy THREDDS catalog and some documentation updates
Release 0.7