v0.4.0 Cluster and resources management

What's Changed

• Contract fee by @naure in #12
• Cluster mgmt by @naure in #13
• Node and Cluster Resources by @naure in #14
• Bucket resources by @naure in #15
• Simulate resource management and node replacement by @naure in #16
• atomic-tx: use unwrap instead of return Err by @naure in #17
• Doc by @naure in #18
• Upsert account by @naure in #19
• Organize payments around Clusters by @naure in #20
• Increase resources by @naure in #21
• Separate params by @naure in #22
• fix-scripts: fix Cash type-info and move demo code to demo.js by @naure in #23
• admin: add admin function to withdraw funds by @naure in #24
• Node trust for cluster management by @naure in #25

Full Changelog: v0.3.0...v0.4.0