Dockerfile for builing from source

This allows Docker Hub to automatically build a new Docker image
for each new CellProfiler commit. The image will be based on
CentOS 6 and install CellProfiler's dependencies via RPM.

cellprofiler-avoid-blank-libdir-for-libjvm.diff

@@ -0,0 +1,12 @@
+--- cellprofiler/utilities/setup.py.orig	2013-10-16 19:26:11.279334211 -0400
++++ cellprofiler/utilities/setup.py	2013-10-16 19:26:38.739329959 -0400
+@@ -106,7 +106,8 @@
+                                      stdout=subprocess.PIPE)
+                 stdout, stderr = p.communicate()
+                 jvm_dir = stdout.strip()
+-                library_dirs.append(jvm_dir)
++                if jvm_dir:
++                    library_dirs.append(jvm_dir)
+                 libraries = ["jvm"]
+             extensions += [Extension(name="javabridge",
+                                      sources=javabridge_sources,

cellprofiler-frozen.diff

@@ -0,0 +1,11 @@
+--- CellProfiler.py.orig	2013-10-16 20:59:07.459360385 -0400
++++ CellProfiler.py	2013-10-16 20:16:34.079360393 -0400
+@@ -20,6 +20,8 @@
+ import tempfile
+ from cStringIO import StringIO
+
++sys.frozen = True
++
+ if sys.platform.startswith('win'):
+     # This recipe is largely from zmq which seems to need this magic
+     # in order to import in frozen mode - a topic the developers never

threshold.diff

@@ -0,0 +1,11 @@
+--- cellprofiler/cpmath/threshold.py    2014-07-23 13:39:57.000000000 -0400
++++ cellprofiler/cpmath/threshold.py 2014-10-27 16:21:40.719976873 -0400
+@@ -417,7 +417,7 @@
+     # data
+     #
+     r = np.random.RandomState()
+-    r.seed(cropped_image[:100].tolist())
++    r.seed(np.frombuffer(cropped_image[:100].data, np.uint8).tolist())
+     for data in (
+         r.permutation(cropped_image)[0:(len(cropped_image) / 10)],
+         cropped_image):