Allow include statements not terminated by a semicolon

The lexer passes the semicolon to the parser, which will read over it.
Resolves https://github.com/behdad/fonttools/issues/552.

Lib/fontTools/feaLib/lexer.py

@@ -187,9 +187,9 @@ class IncludingLexer(object):
                 fname_type, fname_token, fname_location = lexer.next()
                 if fname_type is not Lexer.FILENAME:
                     raise FeatureLibError("Expected file name", fname_location)
-                semi_type, semi_token, semi_location = lexer.next()
-                if semi_type is not Lexer.SYMBOL or semi_token != ";":
-                    raise FeatureLibError("Expected ';'", semi_location)
+                #semi_type, semi_token, semi_location = lexer.next()
+                #if semi_type is not Lexer.SYMBOL or semi_token != ";":
+                #    raise FeatureLibError("Expected ';'", semi_location)
                 curpath, _ = os.path.split(lexer.filename_)
                 path = os.path.join(curpath, fname_token)
                 if len(self.lexers_) >= 5:

Lib/fontTools/feaLib/lexer_test.py

@@ -141,8 +141,11 @@ class IncludingLexerTest(unittest.TestCase):
             "I1a include1.fea:1",
             "I0 include0.fea:1",
             "I1b include1.fea:3",
+            "; include2.fea:2",
             "I2b include2.fea:3",
+            "; include3.fea:2",
             "I3b include3.fea:3",
+            "; include4.fea:2",
             "I4b include4.fea:3"
         ])
 

Lib/fontTools/feaLib/testdata/include1.fea

@@ -1,3 +1,3 @@
 I1a
-include(include0.fea);
+include(include0.fea)
 I1b