allow default options to be modified in constructor
not sure why npm install (or maybe my editor?) altered the layout of the keywords parameter in package.json but I'm putting it back the way it was
rm'ing newline at end of file that wasn't there before, just trying to keep the diff clean, can rebase this if you want
Merge branch 'master' into set-url
don't pollute
Merge pull request #6 from Trott/set-url

allow default options to be modified in constructor