Initial commit of new open_exoplanet_catalogue module.
Fixed issues addressed in #331.
Additional revisions as addressed in #331
Revisions addressed #331
Additional changes addressed in #331
Fixed issues with doc strings addressed by travis build.
Fixed doc strings
Edit of Number class doc string
Doc string edit
Changed urllib2 to urllib in monkey patch
Fix to local data filename
Fix to local data filepath
Added *.xml.gz to tests setup
Fix to test
Fix returning file
Updated tests to use proper findvalue function
Fix to import order in __init__
Typo fix
Changed imports
Bug fix with tag keys