Add \dots commands

Add all of the \dots commands, and import their metrics from the ttf files.

Fixes #23

Auditors: alpert

metrics/extract_ttfs.py

@@ -10,6 +10,10 @@ metrics_to_extract = {
         u"\u2245",
         u"\u0020",
         u"\u00a0",
+        u"\u2026",
+        u"\u22ef",
+        u"\u22f1",
+        u"\u22ee",
     ]
 }