fix for String() method on Event

thanks Alex Brainman

https://codereview.appspot.com/105370044/
Don't set the Write Op for attribute notifications

closes #4
Don't build on Plan 9 or Solaris (thanks @4ad)

https://codereview.appspot.com/108110046
v0.14.0

just doing a minor version because nobody is depending on this package yet.