Update MANIFEST to include OpenCL kernel

Update MANIFEST to include OpenCL kernel. Fixes #37.

MANIFEST.in

@@ -1,4 +1,5 @@
 include COPYING.txt
 include idtxl/infodynamics.jar
+include idtxl/gpuKnnKernelNoIdx.cl
 recursive-include test/data *
 recursive-include docs *

setup.py

@@ -9,23 +9,24 @@
 setup(
     name='idtxl',
     packages=['idtxl'],
+    include_package_data=True,
     version='1.0',
     description='Information Dynamics Toolkit xl',
     author='Patricia Wollstadt, Joseph T. Lizier, Raul Vicente, Conor Finn, Mario Martinez-Zarzuela, Pedro Mediano, Leonardo Novelli, Michael Wibral',
     author_email='p.wollstadt@gmail.com',
     url='https://github.com/pwollstadt/IDTxl',
     long_description=long_description,
     classifiers=[
-    "Programming Language :: Python",
-    "Programming Language :: Python :: 3",
-    "Development Status :: 5 - Production/Stable",
-    "Operating System :: POSIX :: Linux",
-    "Intended Audience :: Science/Research",
-    "Environment :: Console",
-    "Environment :: Other Environment",
-    "Topic :: Scientific/Engineering :: Bio-Informatics",
-    "Topic :: Scientific/Engineering :: Physics",
-    "Topic :: Scientific/Engineering :: Information Analysis",
-    "Topic :: Scientific/Engineering :: Medical Science Apps.",
+        "Programming Language :: Python",
+        "Programming Language :: Python :: 3",
+        "Development Status :: 5 - Production/Stable",
+        "Operating System :: POSIX :: Linux",
+        "Intended Audience :: Science/Research",
+        "Environment :: Console",
+        "Environment :: Other Environment",
+        "Topic :: Scientific/Engineering :: Bio-Informatics",
+        "Topic :: Scientific/Engineering :: Physics",
+        "Topic :: Scientific/Engineering :: Information Analysis",
+        "Topic :: Scientific/Engineering :: Medical Science Apps.",
     ]
 )