Bring keywords.txt up to date

I forgot to update this with some recent additions, and it looks like I'm not the only one!

Sync up with classes, enums, functions out of RTClib.h

keywords.txt

@@ -1,5 +1,5 @@
 #######################################
-# Syntax Coloring Map For RTC
+# Syntax Coloring Map For RTClib
 #######################################
 
 #######################################
@@ -9,23 +9,40 @@
 DateTime	KEYWORD1
 TimeSpan	KEYWORD1
 RTC_DS1307	KEYWORD1
+RTC_DS3231	KEYWORD1
+RTC_PCF8523	KEYWORD1
 RTC_Millis	KEYWORD1
 RTC_Micros	KEYWORD1
 Ds1307SqwPinMode	KEYWORD1
+Ds3231SqwPinMode	KEYWORD1
+Ds3231Alarm1Mode	KEYWORD1
+Ds3231Alarm2Mode	KEYWORD1
+Pcf8523SqwPinMode	KEYWORD1
+PCF8523TimerClockFreq	KEYWORD1
+PCF8523TimerIntPulse	KEYWORD1
+Pcf8523OffsetMode	KEYWORD1
 
 #######################################
 # Methods and Functions (KEYWORD2)
 #######################################
 
+isValid	KEYWORD2
 year	KEYWORD2
 month	KEYWORD2
 day	KEYWORD2
 hour	KEYWORD2
+twelveHour	KEYWORD2
+isPM	KEYWORD2
 minute	KEYWORD2
 second	KEYWORD2
 dayOfTheWeek	KEYWORD2
 secondstime	KEYWORD2
 unixtime	KEYWORD2
+days	KEYWORD2
+hours	KEYWORD2
+minutes	KEYWORD2
+seconds	KEYWORD2
+totalseconds	KEYWORD2
 begin	KEYWORD2
 adjust	KEYWORD2
 adjustDrift	KEYWORD2
@@ -35,6 +52,22 @@ readSqwPinMode	KEYWORD2
 writeSqwPinMode	KEYWORD2
 timestamp	KEYWORD2
 toString	KEYWORD2
+readnvram	KEYWORD2
+writenvram	KEYWORD2
+setAlarm1	KEYWORD2
+setAlarm2	KEYWORD2
+disableAlarm	KEYWORD2
+clearAlarm	KEYWORD2
+alarmFired	KEYWORD2
+getTemperature	KEYWORD2
+lostPower	KEYWORD2
+initialized	KEYWORD2
+enableSecondTimer	KEYWORD2
+disableSecondTimer	KEYWORD2
+enableCountdownTimer	KEYWORD2
+disableCountdownTimer	KEYWORD2
+deconfigureAllTimers	KEYWORD2
+calibrate	KEYWORD2
 
 #######################################
 # Constants (LITERAL1)