Removed StringIO which wasn't being used.

smartytotwig/__init__.py

@@ -21,7 +21,7 @@
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 """
-import fileinput, StringIO
+import fileinput
 from smartytotwig.smarty_grammar import smarty_language
 from smartytotwig.pyPEG import parse, parseLine, parser