Merge pull request #247 from FrankBoesing/patch-5

fix warning: comparison is always false due to limited range of data …

teensy3/Stream.cpp

   boolean isNegative = false;
   boolean isFraction = false;
   long value = 0;
-  char c;
+  int c;
   float fraction = 1.0;
 
   c = peekNextDigit();