Update README for version 2.3

Update version to 2.2

Update version to 2.1

Merge branch 'master' into pr/12

Conflicts:

NVActivityIndicatorView/Animations/NVActivityIndicatorAnimationBallPulse
Rise.swift
	NVActivityIndicatorViewDemo.xcodeproj/project.pbxproj

Merge pull request ninjaprox#7 from gregttn/refactoring

Refactor constructor using default parameters

Update version 1.2

Change project structure

Remove cell border in demo