update elements and fix some bugs

lib/src/prism/components/prism-diff.js

+Prism.languages.diff = {
+        'coord': [
+                // Match all kinds of coord lines (prefixed by "+++", "---" or "***").
+                /^(?:\*{3}|-{3}|\+{3}).*$/m,
+                // Match "@@ ... @@" coord lines in unified diff.
+                /^@@.*@@$/m,
+                // Match coord lines in normal diff (starts with a number).
+                /^\d+.*$/m
+        ],
+
+        // Match inserted and deleted lines. Support both +/- and >/< styles.
+        'deleted': /^[-<].+$/m,
+        'inserted': /^[+>].+$/m,
+
+        // Match "different" lines (prefixed with "!") in context diff.
+        'diff': {
+                'pattern': /^!(?!!).+$/m,
+                'alias': 'important'
+        }
+};