adding stdout and stderr options to the output of profiling

doc/library/config.txt

@@ -340,11 +340,13 @@ import theano and print the config variable, as in:
 
 .. attribute:: profiling.destination
 
-    String value
+    String value: '', 'stderr', 'stdout', or any string
 
     Default ''
 
     Name of the destination file for the profiling output.
+    The profiling output can be either directed to stdout,
+    or stderr and any aribtrary file.
     If string is empty then profiling output is directed
     to stderr.
 

theano/compile/profiling.py

@@ -78,11 +78,13 @@ def _atexit_print_fn():
     """
     to_sum = []
 
-    if config.profiling.destination == '':
+    if config.profiling.destination in ['', 'stderr']:
         destination_file = sys.stderr
+    elif config.profiling.destination == 'stdout':
+        destination_file = sys.stdout
     else:
         destination_file = open(config.profiling.destination, 'w')
-        
+
     for ps in _atexit_print_list:
         if ps.fct_callcount or ps.compile_time > 0:
             ps.summary(file=destination_file,