1.0.0-beta.21

• Fixed popup wrong position issues in some conditions (#16)
• Exposed layout helpers as utils: getOffsetParent, getPageOffset, getBoundingRect and getViewportRect
• Duplicated signature showing with click on button (better for mobile)
• Tweaked action buttons style in struct view to work better for touch devices
• Changed struct view to open a link in a new tab
• Added limit and limitCollapsed options support for struct view
• Fixed pie chart in signature view popups to work in all browsers (#17)
• Fixed struct view signature popup to show a path from a struct's data root