Change test scripts to use python3; bytecode tests use python3.4.

I upgraded to Python 3.4.0, so needed to make these changes.  Hopefully
the tests still run with Python 3.3.x (the scripts use python3 so are
agnostic as to the subversion).

Bytecode tests are tightly coupled to the Python version, and now some
fail against Python 3.4.

tests/bytecode/run-tests

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-CPYTHON3=python3.3
+CPYTHON3=python3.4
 MP_CPY=../../unix-cpy/cpy
 
 RM=/bin/rm
@@ -17,8 +17,8 @@ function run_test_on_dir() {
         basename=$(basename $file .py)
 
         $CPYTHON3 -B -c "import compileall; compileall.compile_file('$file', quiet=True)"
-        #/usr/lib/python3.3/compileall.py $file
-        $CPYTHON3 -B unpyc.py $1/__pycache__/$basename.cpython-33.pyc > output/$basename.pycout
+        #/usr/lib/python3.4/compileall.py $file
+        $CPYTHON3 -B unpyc.py $1/__pycache__/$basename.cpython-34.pyc > output/$basename.pycout
 
         $MP_CPY $file | $CPYTHON3 -B check.py output/$basename.pycout
     done

tests/run-tests

@@ -1,4 +1,4 @@
-#! /usr/bin/env python3.3
+#! /usr/bin/env python3
 
 import os
 import subprocess
@@ -6,10 +6,10 @@ import sys
 from glob import glob
 
 if os.name == 'nt':
-    CPYTHON3 = 'python3.3.exe'
+    CPYTHON3 = 'python3.exe'
     MP_PY = '../windows/micropython.exe'
 else:
-    CPYTHON3 = 'python3.3'
+    CPYTHON3 = 'python3'
     MP_PY = '../unix/micropython'
 
 def rm_f(fname):