Remove unnecessary test files

Mobile tear sheet and related image file removed because they were not
necessary any more.

app/modules/MobileTearSheet.jsx

@@ -1,60 +0,0 @@
-import React from 'react';
-import {StylePropable} from 'material-ui/lib/mixins';
-
-const MobileTearSheet = React.createClass({
-
-  propTypes: {
-    children: React.PropTypes.node,
-    height: React.PropTypes.number,
-  },
-
-  contextTypes: {
-    muiTheme: React.PropTypes.object,
-  },
-
-  mixins: [
-    StylePropable,
-  ],
-
-  getDefaultProps() {
-    return {
-      height: 500,
-    };
-  },
-
-  render() {
-    const styles = {
-      root: {
-        float: 'left',
-        marginBottom: 24,
-        marginRight: 24,
-        width: 360,
-        height: "100%",
-      },
-      container: {
-        border: 'solid 1px #d9d9d9',
-        borderBottom: 'none',
-        height: '100%',
-        overflow: 'hidden',
-      },
-      bottomTear: {
-        display: 'block',
-        position: 'relative',
-        marginTop: -10,
-        width: 360,
-      },
-    };
-
-    return (
-      <div style={this.prepareStyles(styles.root)} className="tearsheet">
-        <div style={this.prepareStyles(styles.container)}>
-          {this.props.children}
-        </div>
-        <img style={this.prepareStyles(styles.bottomTear)} src="images/bottom-tear.svg" />
-      </div>
-    );
-  },
-
-});
-
-export default MobileTearSheet;