Removes Epirus specific code from Web3j (#1212)

* Refactors epirus account code, adds test for Epirus Platform functionality

* fix failing test if no login token file

* Removes epirus specific code from web3j

* remove gradle lineS

Author: josh-richardson

core/src/main/java/org/web3j/account/LocalWeb3jAccount.java

@@ -14,7 +14,6 @@
 
 import java.util.concurrent.ScheduledExecutorService;
 
-import org.web3j.account.LocalWeb3jAccount;
 import org.web3j.protocol.core.Batcher;
 import org.web3j.protocol.core.Ethereum;
 import org.web3j.protocol.core.JsonRpc2_0Web3j;
@@ -23,14 +22,6 @@
 /** JSON-RPC Request object building factory. */
 public interface Web3j extends Ethereum, Web3jRx, Batcher {
 
-    static Web3j build() throws Exception {
-        return new JsonRpc2_0Web3j(LocalWeb3jAccount.getOnlineServicesHttpService(Network.MAINNET));
-    }
-
-    static Web3j build(Network network) throws Exception {
-        return new JsonRpc2_0Web3j(LocalWeb3jAccount.getOnlineServicesHttpService(network));
-    }
-
     /**
      * Construct a new Web3j instance.
      *