Fix build scripts to run on Windows.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1664 c400ca83-b69d-9dd7-9705-49c6b8615e23
MSIE fixes for apps: arrow chars, scrollbar props, sessionStorage.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1665 c400ca83-b69d-9dd7-9705-49c6b8615e23