Merge pull request #129 from vexorian/fix840

If api's timelimit is 840000, return 2000.
Merge pull request #128 from vexorian/gridfixhtmlclean

Fix grid. Further HTML cleanup and tweaks.
use java.util.UUID for random key generation
Merge branch 'master' of https://github.com/shivawu/topcoder-greed