moved library code back to root from sub-folder

when github was adding a hash to the library download zip, there was confusion from beginners about needing to rename the unzipped folder before moving into the arduino ide.
this library has been prepped (thijse) for the arduino library manager, which requires the library to be in the root directory.  Having the library in the manager also removes the "beginner user hash" concern.

Author: br3ttb

PID_v1/PID_v1.cpp renamed to PID_v1.cpp

@@ -1,5 +1,5 @@
 /**********************************************************************************************
- * Arduino PID Library - Version 1.0.1
+ * Arduino PID Library - Version 1.1.1
  * by Brett Beauregard <[email protected]> brettbeauregard.com
  *
  * This Library is licensed under a GPLv3 License

PID_v1/PID_v1.h renamed to PID_v1.h

@@ -1,6 +1,6 @@
 #ifndef PID_v1_h
 #define PID_v1_h
-#define LIBRARY_VERSION	1.0.0
+#define LIBRARY_VERSION	1.1.1
 
 class PID
 {

PID_v1/library.properties

@@ -1,15 +1,11 @@
 ***************************************************************
-* Arduino PID Library - Version 1.1.0
- 
+* Arduino PID Library - Version 1.1.1
 * by Brett Beauregard <[email protected]> brettbeauregard.com
- 
 *
- 
 * This Library is licensed under a GPLv3 License
-
 ***************************************************************
 
- - To Use, copy the PID_v1 folder into the Arduino\Libraries directory
-
  - For an ultra-detailed explanation of why the code is the way it is, please visit: 
-   http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-introduction/
+   http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-introduction/
+
+ - For function documentation see:  http://playground.arduino.cc/Code/PIDLibrary

README.txt

@@ -1,7 +1,7 @@
 {
   "name": "PID",
   "keywords": "PID, controller, signal",
-  "description": "PID controller calculates an 'error' value as the difference between a measured input and a desired setpoint. The controller attempts to minimize the error by adjusting an output.",
+  "description": "A PID controller seeks to keep some input variable close to a desired setpoint by adjusting an output. The way in which it does this can be 'tuned' by adjusting three parameters (P,I,D).",
   "url": "http://playground.arduino.cc/Code/PIDLibrary",
   "include": "PID_v1",
   "authors":

PID_v1/examples/PID_AdaptiveTunings/PID_AdaptiveTunings.ino renamed to examples/PID_AdaptiveTunings/PID_AdaptiveTunings.ino

@@ -0,0 +1,9 @@
+name=PID
+version=1.1.1
+author=Brett Beauregard 
+maintainer=Brett Beauregard
+sentence=PID controller
+paragraph=A PID controller seeks to keep some input variable close to a desired setpoint by adjusting an output. The way in which it does this can be 'tuned' by adjusting three parameters (P,I,D).
+category=Signal Input/Output
+url=http://playground.arduino.cc/Code/PIDLibrary
+architectures=*