Merge pull request #68 from shawnscode/0.7.0

0.7.0

Merge pull request #60 from shawnscode/0.5.1

Merge pull request #54 from shawnscode/0.5.0

0.5.0

Merge pull request #50 from shawnscode/dev

Cleans deprecated codes and adds explict 'scope lifetime for `SystemDispatcher`.

Merge pull request #48 from shawnscode/dev

Minor refines.

Merge pull request #43 from shawnscode/scene

Refined the process of scene drawing.

Merge pull request #35 from shawnscode/version

First stable release, v0.1.0! 🎉