Update documentation

Enhanced client package.json

Rename the client package

Make --help output nicer and command naming consistent, closes #4

Pulse stretch command implemented for client

Add unset_error and take down the error flag when all enabled fans have RPM reading, closes #3

0-based indexing for sensor/fan naming

Init fans with 0 PWM

Add return after writing RESPONSE_FAIL, closes #2

Make ECHO command response respect standard command format, closes #1