Added Material Design Icons to Semantic UI material theme.

Author: nielslerches

src/themes/material/assets/fonts/MaterialIcons-Regular.eot

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+The recommended way to use the Material Icons font is by linking to the web font hosted on Google Fonts:
+
+```html
+<link href="https://fonts.googleapis.com/icon?family=Material+Icons"
+      rel="stylesheet">
+```
+
+Read more in our full usage guide:
+http://google.github.io/material-design-icons/#icon-font-for-the-web

src/themes/material/assets/fonts/MaterialIcons-Regular.svg

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+@fontPath: '../../themes/innohead/assets/fonts';
+@fontName: 'MaterialIcons-Regular';
+@fallbackSRC: '';
+
+@width: 1em;
+@height: 1em;
+
+@small: 18px;
+@medium: 24px;
+@large: 48px;
+@big : 66px;
+@huge: 82px;
+@massive: 98px;