add an error message for cloning private repos
handle errors while building
Upgrade to Polymer 0.10.0-pre.11
Merge pull request #1981 from ussuri/upgrade-to-polymer-0.10.0-pre.11

Upgrade to Polymer 0.10.0-pre.11
Remember repoUrl if append .git to it.
Merge pull request #1982 from dart-lang/git_rem_repo

Remember repoUrl if append .git to it.
Fix null check in git commit.
Merge pull request #1988 from dart-lang/fix_commit_null

Fix null check in git commit.
nit
Merge pull request #1979 from devoncarew/devoncarew_clone_private

add an error message for cloning private repos
Merge branch 'master' into devoncarew_handle_analysis_errors
Merge pull request #1980 from devoncarew/devoncarew_handle_analysis_errors

handle errors while building
Workaround: item clicking didn't work in spark-menu

onClick and onMouseUp have inexplicably stopped firing in <spark-selector>, but onMouseDown is fine, so use that for now.
Merge pull request #1992 from ussuri/fix-clicking-not-working-in-menu

Workaround: item clicking didn't work in spark-menu
Resolve most of the nagging dart2js warnings during `grind deploy`
Merge pull request #1996 from ussuri/warnings-in-dart2js-run

Resolve most of the nagging dart2js warnings during `grind deploy`