PID: Remove examples/keywords

This was needed to accomplish the RC_Channels changeover, and the PID
library is on it's way out of the system so removal of examples rather
then maintainance made more sense.

libraries/PID/examples/pid/pid.cpp

@@ -1,55 +0,0 @@
-/*
- *       Example of PID library.
- *       2010 Code by Jason Short. DIYDrones.com
- */
-
-#include <AP_HAL/AP_HAL.h>
-#include <PID/PID.h> // ArduPilot Mega RC Library
-
-void setup();
-void loop();
-
-const AP_HAL::HAL& hal = AP_HAL::get_HAL();
-
-long radio_in;
-long radio_trim;
-
-PID pid;
-
-void setup()
-{
-    hal.console->printf("ArduPilot Mega PID library test\n");
-
-    hal.scheduler->delay(1000);
-    //rc.trim();
-    radio_trim = hal.rcin->read(0);
-
-    pid.kP(1);
-    pid.kI(0);
-    pid.kD(0.5f);
-    pid.imax(50);
-    pid.save_gains();
-    pid.kP(0);
-    pid.kI(0);
-    pid.kD(0);
-    pid.imax(0);
-    pid.load_gains();
-    hal.console->printf(
-            "P %f  I %f  D %f  imax %d\n",
-            (double)pid.kP(),
-            (double)pid.kI(),
-            (double)pid.kD(), pid.imax());
-}
-
-void loop()
-{
-    hal.scheduler->delay(20);
-    //rc.read_pwm();
-    long error  = hal.rcin->read(0) - radio_trim;
-    long control= pid.get_pid(error, 1);
-
-    hal.console->printf("control: ");
-    hal.console->printf("%ld\n", control);
-}
-
-AP_HAL_MAIN();

libraries/PID/examples/pid/wscript

@@ -1,7 +0,0 @@
-#!/usr/bin/env python
-# encoding: utf-8
-
-def build(bld):
-    bld.ap_example(
-        use='ap',
-    )

libraries/PID/keywords.txt

@@ -1,9 +0,0 @@
-PID		KEYWORD1
-get_pid		KEYWORD2
-reset_I		KEYWORD2
-kP		KEYWORD2
-kD		KEYWORD2
-kI		KEYWORD2
-imax		KEYWORD2
-load_gains	KEYWORD2
-save_gains	KEYWORD2