Spindle speed bug fix.

- Spindle speed updating wasn’t working in the g-code parser due to
some borked up logic on my part. Fixed it and should be operating as
intended for both normal and laser spindle modes.

- Elaborated a little more on the new sleep mode in the documentation.

doc/log/commit_log_v1.1.txt

@@ -1,3 +1,41 @@
+----------------
+Date: 2016-10-11
+Author: Sonny Jeon
+Subject: v1.1c: New sleep mode. Laser mode and other bug fixes.
+
+- New $SLP sleep mode that will disable spindle, coolant, and stepper
+enable pins. Allows users to disable their steppers without having to
+alter their settings. A reset is required to exit and re-initializes in
+alarm state.
+
+- Laser mode wasn’t updating the spindle PWM correctly (effected
+spindle speed overrides) and not checking for modal states either.
+Fixed both issues.
+
+- While in laser mode, parking motions are ignored, since the power off
+delay with the retract motion would burn the material. It will just
+turn off and not move. A restore immediately powers up and resumes. No
+delays.
+
+- Changing rpm max and min settings did not update the spindle PWM
+calculations. Now fixed.
+
+- Increased default planner buffer from 16 to 17 block. It seems to be
+stable, but need to monitor this carefully.
+
+- Removed software debounce routine for limit pins. Obsolete.
+
+- Fixed a couple parking motion bugs. One related to restoring
+incorrectly and the other the parking rate wasn’t compatible with the
+planner structs.
+
+- Fixed a bug caused by refactoring the critical alarms in a recent
+push. Soft limits weren’t invoking a critical alarm.
+
+- Updated the documentation with the new sleep feature and added some
+more details to the change summary.
+
+
 ----------------
 Date: 2016-09-28
 Author: Sonny Jeon

doc/markdown/interface.md

@@ -250,7 +250,8 @@ Feedback messages provide non-critical information on what Grbl is doing, what i
 
   - `[MSG:Restoring defaults]` - Appears as an acknowledgement message when restoring EEPROM defaults via a `$RST=` command. An 'ok' still appears immediately after to denote the `$RST=` was parsed and executed.
   
-  - `[MSG:Sleeping]` - Appears as an acknowledgement message when Grbl's sleep mode is invoked by issuing a `$SLP` command when idle. Note that Grbl-Mega may invoke this at any time when the sleep timer option has been enabled and the timeout has been exceeded. Grbl may only be exited by a reset in the sleep state and will automatically enter an alarm state since the steppers were disabled.
+  - `[MSG:Sleeping]` - Appears as an acknowledgement message when Grbl's sleep mode is invoked by issuing a `$SLP` command when in IDLE or ALARM states. Note that Grbl-Mega may invoke this at any time when the sleep timer option has been enabled and the timeout has been exceeded. Grbl may only be exited by a reset in the sleep state and will automatically enter an alarm state since the steppers were disabled.
+	  - NOTE: Sleep will also invoke the parking motion, if it's enabled. However, if sleep is commanded during an ALARM, Grbl will not park and will simply de-energize everything and go to sleep.
 
 - **Queried Feedback Messages:**