Addressed optional PWM min value issue. Updated docs.

- [fix] Spindle PWM minimum value had some typos. Fixed the macros to
compile correctly. Only effects users that enable SPINDLE_MINIMUM_PWM.
The name changed to SPINDLE_PWM_MIN_VALUE for consistency sake.

- Updated the laser documentation.

doc/log/commit_log_v1.1.txt

@@ -1,3 +1,18 @@
+----------------
+Date: 2016-12-12
+Author: Sonny Jeon
+Subject: Updating steam.py streaming script
+
+- Added push message capability to the stream.py streaming script. It
+prints out as a `Debug:` string in the output.
+
+
+----------------
+Date: 2016-12-11
+Author: Sonny Jeon
+Subject: Updated documentation.
+
+
 ----------------
 Date: 2016-12-10
 Author: Sonny Jeon