CustomTabBar

Forked code from https://github.com/v-braun/VBRRollingPit and made some changes.

Mainly all the credits goes to v-braun.

Changes

• TabBar items animations (now the items will not dissapear while the animation occurs, instead the items will move based of which item is active or not).

• Renamed / Added new properties

IBInspectable properties

• customBarBackgroundColor
• customBarHeight
• customBarTopRadius
• customBarBottomRadius
• customBarCircleBackgroundColor
• customBarCircleRadius
• customBarMarginBottom
• customBarMarginTop
• customBarMarginLeft
• customBarMarginRight