Whitelist svg camelcase attributes in htmlhint

This is better than ignoring all camelcase.

Introduced by htmlhint/HTMLHint#121 and released in 0.9.13.

However, 0.9.13 is incompatible with node v0.10.  This was fixed
in htmlhint/HTMLHint#132, but there has not been a release since
(in 8 months).

Therefore we are pinning to today's git version instead of a release.
This gets us the camelcase whitelisting feature and doesn't break with
node v0.10.

Change-Id: I1e3b6c0c96ef24662b46497b1a601bde0dae5704

.htmlhintrc

@@ -1,6 +1,6 @@
 {
     "alt-require": true,
-    "attr-lowercase": false,
+    "attr-lowercase": ["viewBox"],
     "attr-no-duplication": true,
     "attr-unsafe-chars": true,
     "attr-value-double-quotes": true,

package.json

@@ -11,7 +11,7 @@
     }
   ],
   "devDependencies": {
-    "htmlhint": "0.9.12",
+    "htmlhint": "yaniswang/HTMLHint#152a114f",
     "in-publish": "2.x",
     "jasmine-ajax": "3.3.x",
     "jasmine-core": "2.4.x",