"git pullall" now handles both feature and master updates
Update for new workflow
Update Workflow and Code-Reviews with our new code review process based on the new script "git review".
Add feature branch splitting and useful alias info
Remove now-obsolete Using-Git page. Update UpdatingDR page with git submodule info.
Add a new page on the workflow we'll use now that we've switched to git, including information on the DynamoRIO submodule. Add a link to that page from Contributing.