Preview release with faster tests, simplified API, and bug fixes

Test improvements.

• Tests now run 10X faster (due to allowing RPS limits to be set higher than CWL service quota limits).
• Increased test coverage.

Incite library API improvements.

• Deleted excess CloudWatchLogs action sub-interfaces (e.g. CloudWatchLogsQueryStarter) as these were cluttering the public API documentation without adding value.

Other improvements.

• Fixed a major set of concurrency/deadlock bugs by refactoring the concurrency design to be closer to the Go language philosophy, relying more on channel communication and less on shared memory.
• Incrementally improved documentation.

We are getting closer to a 1.0 release. The main issue that needs to be resolved to make 1.0 happen is fixing the definition and interface of the file-scope Query function. I would like to improve test coverage a bit as well, but that's secondary.