Support interacitve cmd.
Minimize the fix.
Merge upstream: Add interactive mode
Add simple Suffix Implict Rule.
Add prereqs support for rule.
Add description to each rule.
Remove unnecessary file.
Merge remote-tracking branch 'upstream/master'
Add cmd output in exec.
Make new exec function in global api.
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:xiejw/jake
revert to the last commit with only rule support.
Start to write test.
Now Rule supports Pattern.
Add namespace support for Rule.
Add test cases.
Append more comments.
Fix a bug generating static files.
Merge a fix for dummy file task.