IBInspectable & IBDesignable

• Added pulseFocus Boolean flag that keeps the pulse displayed as the button is highlighted, (issue-217).
• Switched pulseColorOpacity to pulseOpacity.
• Added @IBInspectable where appropriate, (issue-151).
• Added @IBDesignable where appropriate, (issue-151).
• Fixed an issue where the tests were being broken, (issue-224).
• NavigationBarView is now called Toolbar.
• SearchBarView is now called SearchBar.
• SideNavigationViewController is now SideNavigationController.
• Added public leftThreshold and rightThreshold to SideNavigationController, (issue-220).