Merge pull request #36 from caternuson/misc

House cleaning updates

Author: ladyada

Adafruit_MAX31855.cpp

@@ -137,7 +137,7 @@ double Adafruit_MAX31855::readCelsius(void) {
 
   if (v & 0x80000000) {
     // Negative value, drop the lower 18 bits and explicitly extend sign bits.
-    v = 0xFFFFC000 | ((v >> 18) & 0x00003FFFF);
+    v = 0xFFFFC000 | ((v >> 18) & 0x00003FFF);
   } else {
     // Positive value, just drop the lower 18 bits.
     v >>= 18;