Greek caps (#1283)

* Support Greek capital letters

Supports Greek letters ΑΒΕΖΗΙΚΜΝΟΡΤΧ.

Resolves issue #1282.

src/macros.js

@@ -126,6 +126,21 @@ defineMacro("\u211A", "\\mathbb{Q}");
 defineMacro("\u211D", "\\mathbb{R}");
 defineMacro("\u2124", "\\mathbb{Z}");
 
+// Unicode Greek capital letters
+defineMacro("\u0391", "A");
+defineMacro("\u0392", "B");
+defineMacro("\u0395", "E");
+defineMacro("\u0396", "Z");
+defineMacro("\u0397", "H");
+defineMacro("\u0399", "I");
+defineMacro("\u039A", "K");
+defineMacro("\u039C", "M");
+defineMacro("\u039D", "N");
+defineMacro("\u039F", "O");
+defineMacro("\u03A1", "P");
+defineMacro("\u03A4", "T");
+defineMacro("\u03A7", "X");
+
 defineMacro("\u210E", "\\mathit{h}");   // Planck constant
 
 // Characters omitted from Unicode range 1D400–1D7FF

test/katex-spec.js

@@ -2991,6 +2991,11 @@ describe("Unicode", function() {
         expect("£¥ðℂℍℑℓℕ℘ℙℚℜℝℤℲℵℶℷℸ⅁∀∁∂∃∇∞∠∡∢♠♡♢♣♭♮♯✓°\u00b7").toParse();
     });
 
+    it("should build Greek capital letters", function() {
+        expect("\u0391\u0392\u0395\u0396\u0397\u0399\u039A\u039C\u039D" +
+                "\u039F\u03A1\u03A4\u03A7").toBuild();
+    });
+
     it("should parse arrows", function() {
         expect("←↑→↓↔↕↖↗↘↙↚↛↞↠↢↣↦↩↪↫↬↭↮↰↱↶↷↼↽↾↾↿⇀⇁⇂⇃⇄⇆⇇⇈⇉").toParse();
     });