allow .theanorc.txt being used by default on windows.

doc/install.txt

@@ -283,16 +283,15 @@ Windows V1(bigger install, but simpler instruction + try instruction for gpu)
   (installation folder of theano)
 
   In the USERPROFILE directory 
-  you should create a configuration file .theanorc with the following
+  you should create a configuration file .theanorc.
+  .theanorc.txt is also accepted on Windows if the environment 
+  variable THEANORC is not set. The file should have the following
   two lines:
     .. code-block:: bash
 
       [blas]
       ldflags =
 
-  (Create a text file in Windows Explorer and rename it from the DOS
-  box: "ren xyz.txt .theanorc".)
-
   Space or non ascii caracter are not always supported. If that is your case,
   Set the environment variable 'THEANO_FLAGS' to the value 'blas.ldflags='
 

theano/configparser.py

@@ -27,6 +27,9 @@ THEANO_FLAGS=os.getenv("THEANO_FLAGS","")
 # precedence over those in files on the left.
 def config_files_from_theanorc():
     rval = [os.path.expanduser(s) for s in os.getenv('THEANORC', '~/.theanorc').split(os.pathsep)]
+    if  os.getenv('THEANORC') is None and sys.platform=="win32":
+        #To don't need to change the filename and make it open easily
+        rval.append(os.path.expanduser('~/.theanorc.txt'))
     return rval
 theano_cfg = ConfigParser.SafeConfigParser()
 theano_cfg.read(config_files_from_theanorc())