title: buildbot: not building, instead shows a "?"
body: <p>I'm trying to use buildbot for CI purposes. I have setup a buildmaster and buildslave. And, they are both connected. (I'm attaching my master.cfg below)</p>
  
  <p>I have the following problems:</p>
  
  <p>a) I can see the changes committed on the Waterfall page, which means SVNPoller is working fine. However, none of the changes are getting built. I get a "?" on the buildbot page.</p>
  
  <p>b) When I try to do a force build from http:// localhost:8010/builders, I get an error in the logs:
  [HTTPChannel,1,10.0.0.58] ..but not authorized</p>
  
  <pre><code>c = BuildmasterConfig = {}
  
  from buildbot.buildslave import BuildSlave
  c['slaves'] = [BuildSlave("example-slave", "pass")]
  
  c['slavePortnum'] = 9989
  
  from buildbot.changes.svnpoller import SVNPoller
  c['change_source'] = []
  c['change_source'].append(SVNPoller(
          'file:///my/repo/path/trunk',
          pollinterval=300))
  
  from buildbot.schedulers.basic import SingleBranchScheduler
  from buildbot.schedulers.forcesched import ForceScheduler
  from buildbot.changes import filter
  c['schedulers'] = []
  c['schedulers'].append(SingleBranchScheduler(
                              name="all",
                              change_filter=filter.ChangeFilter(branch='trunk'),
                              treeStableTimer=None,
                              builderNames=["runtests"]))
  c['schedulers'].append(ForceScheduler(
                              name="force",
                              builderNames=["runtests"]))
  
  from buildbot.process.factory import BuildFactory
  from buildbot.steps.source import Git
  from buildbot.steps.source import SVN
  from buildbot.steps.shell import ShellCommand
  
  from buildbot.steps import source, shell
  from buildbot.process import factory
  
  f = factory.BuildFactory()
  f.addStep(source.SVN(svnurl="file:///my/repo/path/trunk/", mode="copy"))
  f.addStep(shell.ShellCommand(command=["cmake", "."]))
  f.addStep(shell.ShellCommand(command=["make", "all"]))
  
  from buildbot.config import BuilderConfig
  
  c['builders'] = []
  c['builders'].append(
      BuilderConfig(name="runtests",
        slavenames=["example-slave"],
        factory=f))
  
  c['status'] = []
  
  from buildbot.status import html
  from buildbot.status.web import authz, auth
  
  authz_cfg=authz.Authz(
      auth=auth.BasicAuth([("userid","password")]),
      gracefulShutdown = False,
      forceBuild = 'auth', # use this to test your slave once it is set up
      forceAllBuilds = True,
      pingBuilder = False,
      stopBuild = False,
      stopAllBuilds = False,
      cancelPendingBuild = False,
  )
  c['status'].append(html.WebStatus(http_port=8010, authz=authz_cfg))
  
  c['title'] = "My Project"
  c['titleURL'] = "http://my/url"
  
  
  c['buildbotURL'] = "http://localhost:8010/"
  
  
  c['db'] = {
      'db_url' : "sqlite:///state.sqlite",
  }
  </code></pre>