pubspec tweaks, in support of moving towards pub build
fix a speed issue w/ the zlib encoder and js interop
Merge pull request #373 from dart-lang/zlib_speed

fix a speed issue w/ the zlib encoder and js interop
Merge pull request #367 from dart-lang/pub_build

pubspec tweaks, in support of moving towards pub build
Merge branch 'upstream/master'

Conflicts:
	ide/pubspec.yaml