fix(lang): fix small typo.

Author: SekibOmazic

modules/facade/src/lang.es6

@@ -68,7 +68,7 @@ export class StringJoiner {
  }
 }
 
-export class NumerParseError extends Error {
+export class NumberParseError extends Error {
  constructor(message) {
  this.message = message;
  }
@@ -83,7 +83,7 @@ export class NumberWrapper {
  static parseIntAutoRadix(text:string):int {
  var result:int = parseInt(text);
  if (isNaN(result)) {
- throw new NumerParseError("Invalid integer literal when parsing " + text);
+ throw new NumberParseError("Invalid integer literal when parsing " + text);
  }
  return result;
  }
@@ -103,7 +103,7 @@ export class NumberWrapper {
  return result;
  }
  }
- throw new NumerParseError("Invalid integer literal when parsing " + text + " in base " + radix);
+ throw new NumberParseError("Invalid integer literal when parsing " + text + " in base " + radix);
  }
 
  // TODO: NaN is a valid literal but is returned by parseFloat to indicate an error.