removed unused functions

lib/abi.js

@@ -32,15 +32,6 @@ BigNumber.config({ ROUNDING_MODE: BigNumber.ROUND_DOWN });
 
 var ETH_PADDING = 32;
 
-// TODO: make these be actually accurate instead of falling back onto JS's doubles.
-var hexToDec = function (hex) {
-    return parseInt(hex, 16).toString();
-};
-
-var decToHex = function (dec) {
-    return parseInt(dec).toString(16);
-};
-
 /// Finds first index of array element matching pattern
 /// @param array
 /// @param callback pattern