Make 'grind.cmd release' work from Windows
block grind release on Windows
Rebase master
Merge pull request #545 from sunglim/release_for_win

Disable 'grind.cmd release'  from Windows
peg dquery to a specific version
Merge pull request #554 from dart-lang/devoncarew_peg_dquery

peg dquery to a specific version
Update README.md

docs tweak
Merge branch 'upstream/master'