Minor bug fixes: Homing travel calculations. Cycle resuming after spindle and dwell commands.

- Homing travel calculations fixed. It was computing the min travel
rather than max.

- Auto-start disable and pausing after spindle or dwell commands.
Related to plan_synchronize() function call. Now fixed, but still need
to work on the system state.

- Pushed a fix to make this branch more Arduino IDE compatible. Removed
extern call in nuts_bolts.c

- Updated the stepper configuration option of enabling or disabling the
new Adaptive Multi-Axis Step Smoothing Algorithm. Now works either way.

- Updated some copyright info.

nuts_bolts.c

@@ -2,8 +2,8 @@
   nuts_bolts.c - Shared functions
   Part of Grbl
 
+  Copyright (c) 2011-2014 Sungeun K. Jeon
   Copyright (c) 2009-2011 Simen Svale Skogsrud
-  Copyright (c) 2011-2012 Sungeun K. Jeon
 
   Grbl is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -25,7 +25,6 @@
 #include "planner.h"
 
 #define MAX_INT_DIGITS 8 // Maximum number of digits in int32 (and float)
-extern float __floatunsisf (unsigned long);
 
 // Extracts a floating point value from a string. The following code is based loosely on
 // the avr-libc strtod() function by Michael Stumpf and Dmitry Xmelkov and many freely
@@ -79,7 +78,7 @@ int read_float(char *line, uint8_t *char_counter, float *float_ptr)
   
   // Convert integer into floating point.
   float fval;
-  fval = __floatunsisf(intval);
+  fval = (float)intval;
   
   // Apply decimal. Should perform no more than two floating point multiplications for the
   // expected range of E0 to E-4.