v0.13.2 Fixes CreateCanvasBgra bug and supports HttpContent.ReadAsStreamAsync streams

What's Changed

• Restored json format in CreateCanvas by @jakenuts in #60

Full Changelog: v0.13.1...v0.13.2

• Add test coverage for CreateCanvasBgr(a)32
• Supports HttpContent.ReadAsStreamAsync streams
• Fixes #58 and adds tests
• Use a new node ID re-assignment algorithm that produces consistently … sequential ids regardless of concurrency