Switch build system to use CMake completely. (#200)

* switch to CMake completely

...

* cleanup

* Run C tests, update installation instructions.

python/numbuf/__init__.py

@@ -0,0 +1,29 @@
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+# See https://github.com/ray-project/ray/issues/131.
+helpful_message = """
+
+If you are using Anaconda, try fixing this problem by running:
+
+  conda install libgcc
+"""
+
+try:
+  from core.src.numbuf.libnumbuf import *
+except ImportError as e:
+  if hasattr(e, "msg") and isinstance(e.msg, str) and "GLIBCXX" in e.msg:
+    # This code path should be taken with Python 3.
+    e.msg += helpful_message
+  elif hasattr(e, "message") and isinstance(e.message, str) and "GLIBCXX" in e.message:
+    # This code path should be taken with Python 2.
+    if hasattr(e, "args") and isinstance(e.args, tuple) and len(e.args) == 1 and isinstance(e.args[0], str):
+      e.args = (e.args[0] + helpful_message,)
+    else:
+      if not hasattr(e, "args"):
+        e.args = ()
+      elif not isinstance(e.args, tuple):
+        e.args = (e.args,)
+      e.args += (helpful_message,)
+  raise