Code style fixes

Author: fritz-c

src/ReactImageLightbox.js

@@ -842,8 +842,7 @@ var ReactImageLightbox = React.createClass({
                 return;
             }
 
-            var imageStyle = [Styles.image(this.props.animationDuration), baseStyle, transitionStyle];
-            var fitSizes = {};
+            var imageStyle = [Styles.image, baseStyle, transitionStyle];
             if (this.state.zoomLevel > Constant.MIN_ZOOM_LEVEL) {
                 imageStyle.push({ cursor: 'move' });
             }
@@ -942,7 +941,7 @@ var ReactImageLightbox = React.createClass({
             <Portal>
                 <StyleRoot>
                     <div // Floating modal with closing animations
-                        className={"outer" + (this.state.isClosing ? ' closing' : '')}
+                        className={'outer' + (this.state.isClosing ? ' closing' : '')}
                         onWheel={this.handleOuterMousewheel}
                         onMouseMove={this.handleOuterMouseMove}
                         onMouseDown={this.handleOuterMouseDown}

src/Styles.js

@@ -39,15 +39,13 @@ var styles = {
         bottom   : 0,
     },
 
-    image: function(duration) {
-        return {
-            position   : 'absolute',
-            top        : 0,
-            bottom     : 0,
-            margin     : 'auto',
-            maxWidth   : '100%',
-            maxHeight  : '100%',
-        };
+    image: {
+        position   : 'absolute',
+        top        : 0,
+        bottom     : 0,
+        margin     : 'auto',
+        maxWidth   : '100%',
+        maxHeight  : '100%',
     },
     imagePrev: {
         left: '-100%',