CON-1489 load js for Venus using dedicated group

Please consider using $s['tag'] here.
Current implementation gives: 
```
<link rel=stylesheet href=''/><link rel=stylesheet href=''/>
```
instead of:
```
  4 => 
    array (size=2)
      'url' => null
      'tag' => string '<style>			/* Add a pretty logo to Facebook links */
			.mw-fblink {
				background: url(http://static.ak.fbcdn.net/images/icons/favicon.gif) top left no-repeat !important;
				padding-left: 17px !important;
			}</style>' (length=219)
  5 => 
    array (size=2)
      'url' => null
      'tag' => string '<style>a:lang(ar),a:lang(ckb),a:lang(fa),a:lang(kk-arab),a:lang(mzn),a:lang(ps),a:lang(ur){text-decoration:none}a.new,#quickbar a.new{color:#ba0000}

/* cache key: muppet:resourceloader:filter:minify-css:7:c88e2bcd56513749bec09a7e29cb3ffa */</style>' (length=249)
```