Remove leading space from keywords.txt identifier

Each field of keywords.txt is separated by a single true tab. Leading spaces on a keyword identifier causes it to not be recognized by the Arduino IDE. On Arduino IDE 1.6.5 and newer an unrecognized keyword identifier causes the default editor.function.style highlighting to be used (as with KEYWORD2, KEYWORD3).

Reference:
https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#keywords

keywords.txt

@@ -1,12 +1,12 @@
-Skywriter   KEYWORD1
-begin       KEYWORD2
-poll        KEYWORD2
-onGesture   KEYWORD2
-onTouch     KEYWORD2
-onAirwheel  KEYWORD2
-onXYZ       KEYWORD2
-x           KEYWORD3
-y           KEYWORD3
-z           KEYWORD3
-last_gesture KEYWORD3
-last_touch   KEYWORD3
+Skywriter	KEYWORD1
+begin	KEYWORD2
+poll	KEYWORD2
+onGesture	KEYWORD2
+onTouch	KEYWORD2
+onAirwheel	KEYWORD2
+onXYZ	KEYWORD2
+x	KEYWORD3
+y	KEYWORD3
+z	KEYWORD3
+last_gesture	KEYWORD3
+last_touch	KEYWORD3