v0.2.2

Quiqbox v0.2.2

Diff since v0.2.1

Merged pull requests:

• 0.2.1 Updates (#37) (@frankwswang)
• 0.3.0-feature dev (#39) (@frankwswang)
• Minor change of doc and updated package version. (#40) (@frankwswang)
• Specify dep version and loosen test requirements. (#41) (@frankwswang)