clean up .travis.yml
Link to StandardUnitDictionary has moved?

I'm not sure I found the correct new link but at least this resolves to a page in the EML specs family.  THanks for the great work!
Merge pull request #111 from ivanhanigan/patch-2

Updates Link to StandardUnitDictionary
update vignette link name in README
Merge branch 'devel'