add test for catching generator errors
add generator function error catching test
remove duplicate code in toThunk
Merge pull request #116 from island205/master

Remove duplicate code in toThunk
Merge branch 'master' of ssh://github.com/visionmedia/co
Release 3.0.6
remove setImmediate shim, add platform compat notes to readme
remove unused toString
Merge pull request #117 from visionmedia/platform-compatibility

remove setImmediate shim, add platform compat notes to readme