refactor(CLI): better vector building

Instead of using multiple lines to add vectors up involving iterators,
I just add slices together. This should produce less, and possibly
faster machine code, with less ascii code.

Downloads tested with drive2, and are verified to be working !

Close #97

src/mako/cli/lib/cli.py

@@ -82,10 +82,13 @@ def new_method_context(resource, method, c):
     return MethodContext(m, response_schema, params, request_value, media_params, 
                          required_props, optional_props, part_prop)
 
+def comma_sep_fields(fields):
+    return ', '.join('"%s"' % mangle_subcommand(f) for f in fields)
+
 # Returns a string representing a string-vector of mangled names
 # fields is an iterator
 def field_vec(fields):
-    return "vec![%s]" % ', '.join('"%s"' % mangle_subcommand(f) for f in fields)
+    return "vec![%s]" % comma_sep_fields(fields)
 
 def pretty(n):
     return ' '.join(s.capitalize() for s in mangle_subcommand(n).split('-'))