Update README.md with new feature and update test
Change README.md style
Add link to wikipedia for those who have a hard time searching
Add VoidStdLog() and KillStdLog() to help with focused logging.

Improve presubmit.py to test more.

Fix a compilation error in sample-simple/main_test.go.
Fix VoidStdLog().

Damn copy-paste.
Fix errcheck, add sample-complex, export *Writer.

sample-complex is meant to be used as an example how to do inner commands.
Add sample-complex.