Version v0.1.5

• Support tasks that generate multiple outputs
• Support tasks that generate no output
• Forbid merging tasks with different no_save settings
• Minor change in semantics of tasks with the same output

Version v0.1.4

• Support multiple tasks with same output, which will be executed in creation order.
• Fail to run if any tasks depend on inputs that don't exist and are not outputs.

Version v0.1.3

This is what it is, no records :-)