Servo example should use SERVO mode and servoWrite

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Servo object handling fixes: attachment and writing

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Debugging for msg_servoWriteMicroseconds action

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
v2.0.8

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Update version in readme to match release date
Delete version/release date from README

Hard to coordinate with source
#include application.h

Required by spark-cli to compile/flash
added spark-cli usage example to flash firmware
renamed id placeholder to be consistent w/ eg/