Feature/adding priv key wallet

package.json

@@ -83,6 +83,8 @@
     "bignumber.js": "5.0.0",
     "connected-react-router": "4.4.1",
     "cross-env": "^5.1.6",
+    "ethereumjs-util": "^5.2.0",
+    "ethereumjs-wallet": "^0.6.2",
     "ethjs-abi": "0.2.1",
     "extract-text-webpack-plugin": "^3.0.2",
     "history": "4.7.2",

src/api/contracts.ts

@@ -140,8 +140,10 @@ const getPromisedIntances = () => Promise.all(Contracts.map(contr => contr.deplo
 
 let contractsAPI: ContractsMap
 
-export const promisedContractsMap = async (provider?: Provider) => {
-  if (contractsAPI) return contractsAPI
+export const promisedContractsMap = async (provider?: Provider, overwrite?: boolean) => {
+  // overwrite is used to tell the API whether or not
+  // to overwrite the current provider (useful when changing wallets)
+  if (contractsAPI && !overwrite) return contractsAPI
 
   contractsAPI = await init(provider)
   return contractsAPI