v0.3.0

• Supports four view modes
• Supports three drag modes
• Makes the crop box's borders and handlers visible when overflow
• Added some examples
• Fixed some issues

Options

• Add viewMode
• Add dragMode
• Rename touchDragZoom to zoomOnTouch
• Rename mouseWheelZoom to zoomOnWheel
• Rename doubleClickToggle to toggleDragModeOnDblclick
• Rename checkImageOrigin to checkCrossOrigin
• Remove strict (supported byviewMode: 1)
• Remove dragCrop (supported by dragMode: 'crop')