Add latin-1 letters as math symbols (#796)

Additional work is required to render them using Computer Modern, currently we use the fallback font which is Times New Roman.

test/unicode-spec.js

@@ -70,8 +70,8 @@ describe("unicode", function() {
         expect('\\text{ÀàÇçÉéÏïÖöÛû}').toParse();
     });
 
-    it("should not parse Latin-1 outside \\text{}", function() {
-        expect('ÀàÇçÉéÏïÖöÛû').toNotParse();
+    it("should parse Latin-1 outside \\text{}", function() {
+        expect('ÀàÇçÉéÏïÖöÛû').toParse();
     });
 
     it("should parse Cyrillic inside \\text{}", function() {