strategy for splits is now a structure with better parsing.
Better default value for strategy on web page.
Adding an easier way to get the possible strategy flags.
Fixing strategy parsing and worker unit tests.
Merge branch 'master' into resharding

Conflicts:
	go/vt/mysqlctl/split.go
	go/vt/worker/split_clone_test.go
Couple cosmetic changes from review.
Fixing a double error message.
Merge pull request #156 from youtube/resharding

Better parameter parsing for strategy.