Removed extraneous warnings in example

Removed some extraneous warnings in discrete_find_MAP.ipynb that were due to my
particular environment.

Author: bjedwards

pymc/examples/discrete_find_MAP.ipynb

@@ -56,15 +56,7 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stderr",
-       "text": [
-        "WARNING (theano.gof.compilelock): Overriding existing lock by dead process '25402' (I am process '18668')\n"
-       ]
-      }
-     ],
+     "outputs": [],
      "prompt_number": 2
     },
     {
@@ -531,7 +523,7 @@
       "with model:\n",
       "    for i in range(n+1):\n",
       "        s = {'p':0.5, 'surv_sim':i}\n",
-      "        map_est = mc.find_MAP(start=s, vars=model.vars, fmin=bh, minimizer_kwargs={\"method\": \"Powell\"})\n",
+      "        map_est = mc.find_MAP(start=s, vars=model.vars, fmin=bh, minimizer_kwargs={\"method\": /\"Powell\"})\n",
       "        print('surv_sim: %i->%i, p: %f->%f, LogP:%f'%(s['surv_sim'],\n",
       "                                                      map_est['surv_sim'],\n",
       "                                                      s['p'],\n",
@@ -728,16 +720,7 @@
      ],
      "language": "python",
      "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stderr",
-       "text": [
-        "/nfs/adaptive/bedwards/anaconda/envs/pymc-dev/lib/python2.7/site-packages/theano/scan_module/scan_perform_ext.py:85: RuntimeWarning: numpy.ndarray size changed, may indicate binary incompatibility\n",
-        "  from scan_perform.scan_perform import *\n"
-       ]
-      }
-     ],
+     "outputs": [],
      "prompt_number": 9
     },
     {
@@ -1385,4 +1368,4 @@
    "metadata": {}
   }
  ]
-}
+}