Fixed unintended laser mode pausing. Updated documentation. Min SS OVR lowered to 10%.

- [laser] Tested a working version and pushed the wrong one for the
last! 20161203 was pausing upon every spindle speed change. That’s not
right. Fixed so nearly all motions are passed through and does not stop.

- Minimum spindle speed override lower from 50% to 10%. Lasers could
use the lower speeds.

- Fixed a very minor bug related to G80 error checking. Allowed no
error with non-modal motions with axis words. Not correct and fixed.

- Fixed a compile error when disabling VARIABLE_SPINDLE

- [doc] Updated some obsolete documentation.

- [doc] Started a “Laser Mode” document that summarizes how Grbl’s new
laser mode works.

doc/log/commit_log_v1.1.txt

@@ -1,3 +1,50 @@
+----------------
+Date: 2016-12-03
+Author: Sonny Jeon
+Subject: v1.1e: New laser features. G-code parser refactoring. CoreXY homing fix.
+
+- Increment to v1.1e due to new laser features.
+
+- After several discussions with some prominent laser people, a few
+tweaks to the new laser mode has been installed.
+
+- LASER: M3 behaves in a constant power mode.
+
+- LASER: M4 behaves in a dynamic power mode, where the laser power is
+automatically adjusted based on how fast Grbl is moving relative to the
+programmed feed rate. This is the same as the  CONSTANT_POWER_PER_RATE
+config.h option in the last version. NOTE: When not in motion in M4,
+Grbl automatically turns off the laser. Again, it only operates while
+moving!
+
+- LASER: Only G1, G2, and G3 motion modes will turn on the laser. So,
+this means that G0, G80 motion modes will always keep the laser
+disabled. No matter if M3/M4 are active!
+
+- LASER: A spindle stop override is automatically invoked when a laser
+is put in a feed hold. This behavior may be disabled by a config.h
+option.
+
+- Lots of little tweaks to the g-code parser to help streamline it a
+bit. It should no effect how it operates. Generally just added a parser
+flag to track and execute certain scenarios a little more clearly.
+
+- Jog motions now allow line numbers to be passed to it and will be
+displayed in the status reports.
+
+- Fixed a CoreXY homing bug.
+
+- Fixed an issue when $13 is changed, WCO isn’t sent immediately.
+
+- Altered how spindle PWM is set in the stepper ISR. Updated on a step
+segment basis now. May need to change this back if there are any
+oddities from doing this.
+
+- Updated some documentation. Clarified why M0 no longer showing up in
+$G and why a `1.` floating point values are shown with no decimals,
+like so `1`.
+
+
 ----------------
 Date: 2016-11-12
 Author: Sonny Jeon