fix(compiler): allow absolute style urls

[DzmitryShylovich]

Closes #4974

As specified by @tbosch #4974 (comment) :

Yes, this is a valid bug right now

[ozrite]

Its still a bug even in 2017 even in latest version of angular with angular cli. The aboloute paths from within the global css files are not being read for custom font files.
//******************** Global includes **************************

<script type='text/javascript' src ='https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.3/jquery-ui.min.js'></script> <script type="text/javascript" src="js/script.js"></script> <script src="js/bootstrap.min.js"></script>

//****************************** css file from pins-styles.css ****************************
These paths are not being read.
//css file

@charset "UTF-8";

@font-face {
font-family: "pins";
src:url("../pins-fonts/pins.eot");
src:url("../pins-fonts/pins.eot?#iefix") format("embedded-opentype"),
url("../pins-fonts/pins.woff") format("woff"),
url("../pins-fonts/pins.ttf") format("truetype"),
url("../pins-fonts/pins.svg#pins") format("svg");
font-weight: normal;
font-style: normal;

}

I have ported my code to new version of angularCli but after troubleshooting many problems, i found out that the absolute paths are not working. rest of the styles are being loaded.

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