#30: README.md, define 'azimuth', 'elevation'
#30: README.md, define 'Jansky'
#30: README.md, add note on 'Jansky'
#30: README.md, minor language change (link text)
#30: README.md, minor language change (remove typo)
Merge pull request #37 from jeff1evesque/doc_definition

#30: Documentation: Define 'Definition'