VSDropdown v1.0.0 Release

This release of VSDropdown contains following features:

Automatic assignment of direction and frame.
Adapting appearance of dropdown view like background color and font. (Useful when dropdown button has solid background color)
Present dropdown with custom gradient by providing top and bottom color.
Supports two types of animation.
- DropdownAnimation_Scale
- DropdownAnimation_Fade
Supports multiple selection.
Supports multi line dropdown menu items.
Auto dismissal on tapping outside bounds of dropdown.
Provide outline color and width.
Provide dropdown corner radius. (Return corner radius in delegate method instead of directly setting corner radius of layer)

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