Add cimport to the grammar.

Cython/Parser/Grammar

@@ -50,9 +50,9 @@ return_stmt: 'return' [testlist]
 yield_stmt: yield_expr
 raise_stmt: 'raise' [test [',' test [',' test]]]
 import_stmt: import_name | import_from
-import_name: 'import' dotted_as_names
+import_name: ('import' | 'cimport') dotted_as_names
 import_from: ('from' ('.'* dotted_name | '.'+)
-              'import' ('*' | '(' import_as_names ')' | import_as_names))
+              ('import' | 'cimport') ('*' | '(' import_as_names ')' | import_as_names))
 import_as_name: NAME ['as' NAME]
 dotted_as_name: dotted_name ['as' NAME]
 import_as_names: import_as_name (',' import_as_name)* [',']