Remove the hack with filename extension by fixing it correctly.

MANIFEST.in

 global-include *.txt
+global-include *.c
 global-include *.cu
 global-include *.cuh
 global-include *.sh

setup.py

@@ -190,6 +190,7 @@ def do_setup():
           packages=find_packages(),
           install_requires=['numpy>=1.5.0', 'scipy>=0.7.2'],
           package_data={
+              '': ['*.txt', '*.rst', '*.cu', '*.cuh', '*.c', '*.sh', '*.pkl',
               '': ['*.txt', '*.rst', '*.cu', '*.cuh', '*.c', '*.sh', '*.pkl',
                    'ChangeLog'],
               'theano.misc': ['*.sh']

theano/scan_module/scan_perform_ext.py

@@ -52,11 +52,8 @@ except ImportError:
 
             _logger.info("Compiling C code for scan")
             dirname = 'scan_perform'
-            # We use a .txt extensions as otherwise it don't get
-            # included when we create a package to send to pypi
-            # This happen even if we tell to include *.c files
             cfile = os.path.join(theano.__path__[0], 'scan_module',
-                                 'scan_perform.c.txt')
+                                 'scan_perform.c')
             code = open(cfile).read()
             loc = os.path.join(config.compiledir, dirname)
             if not os.path.exists(loc):