fix a bug in .flatMap: exception thrown when resubscribing to stream (fix #29)
update changelog
0.4.2
remove not source files from git
update .gitignore
remove note about edge version from docs
Merge branch 'master' into errors

* master:
  remove note about edge version from docs
  update .gitignore
  remove not source files from git
  0.4.2
  update changelog
  fix a bug in .flatMap: exception thrown when resubscribing to stream
(fix #29)

Conflicts:
	dist/kefir.js
	dist/kefir.min.js
	dist/kefir.min.js.map
	test/in-browser/spec/KefirSpecs.js