Remove obsolete utils

app/utils/cps/bignumber.js

@@ -1,20 +0,0 @@
-import { computed } from '@ember/object';
-import ethers from 'ethers';
-
-export default function(dependentKey, converterMethod) {
-  return computed(dependentKey, {
-    get () {
-      let value = this.get(dependentKey);
-      if (value && ethers.utils.BigNumber.isBigNumber(value)) {
-        return value[converterMethod]();
-      } else {
-        return value;
-      }
-    },
-    set (key, value) {
-      const bnValue = ethers.utils.bigNumberify(value);
-      this.set(dependentKey, bnValue);
-      return bnValue[converterMethod]();
-    }
-  });
-}

app/utils/cps/kredits.js

@@ -1,17 +0,0 @@
-import { computed } from '@ember/object';
-import ethers from 'ethers';
-import formatKredits from 'kredits-web/utils/format-kredits';
-
-export default function(dependentKey, options = {}) {
-  return computed(dependentKey, {
-    get () {
-      const value = this.get(dependentKey);
-      return formatKredits(value, options);
-    },
-    set (key, value) {
-      const bnValue = ethers.utils.bigNumberify(value);
-      this.set(dependentKey, bnValue);
-      return formatKredits(bnValue, options);
-    }
-  });
-}