Use a single tab field separator in keywords.txt

Each field of keywords.txt is separated by a single true tab. When you use multiple tabs it causes the field to be interpreted as empty. On Arduino IDE 1.6.5 and newer an empty KEYWORD_TOKENTYPE causes the default editor.function.style highlighting  to be used (as with KEYWORD2, KEYWORD3). On Arduino IDE 1.6.4 and older it causes the keyword to not be recognized for any special highlighting.

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

keywords.txt

@@ -5,8 +5,8 @@
 ########################################
 # Datatypes (KEYWORD1)
 ########################################
-  
-ADB922S	KEYWORD1    
+
+ADB922S	KEYWORD1 
 KGPS	KEYWORD1
 
 TASK_LIST	KEYWORD1
@@ -102,14 +102,14 @@ PORT	KEYWORD2
 ########################################
 # Constants (LITERAL1)
 ########################################
-BPS_9600		LITERAL1
-BPS_19200		LITERAL1
-BPS_57600		LITERAL1
-BPS_115200		LITERAL1
-DR2		LITERAL1
-DR3		LITERAL1
-DR4		LITERAL1
-DR5		LITERAL1
+BPS_9600	LITERAL1
+BPS_19200	LITERAL1
+BPS_57600	LITERAL1
+BPS_115200	LITERAL1
+DR2	LITERAL1
+DR3	LITERAL1
+DR4	LITERAL1
+DR5	LITERAL1
 
-KashiwaGeeks		LITERAL1
+KashiwaGeeks	LITERAL1