Require ttkit >= 1.10.0, 1.9.0 is too broken for some formats

requirements.txt

@@ -3,5 +3,5 @@ GitPython>=0.3
 South>=0.7
 django-registration>=0.8
 Whoosh>=2.3
-Translate-Toolkit>=1.9.0
+Translate-Toolkit>=1.10.0
 lxml>=3.1.0