lib: change event signature

Changes event message signature to always send an array
of arbitrary arguments. This makes it work same way as
EventEmitter does and also makes its usage similar to
call action.

PR-URL: metarhia/jstp#187
Fixes: metarhia/jstp#134
Fixes: metarhia/jstp#162
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Mykola Bilochub <nbelochub@gmail.com>

test/unit/connection.test.js

@@ -533,7 +533,7 @@ describe('JSTP Connection', () => {
 
   describe('event', () => {
     testPacketSending('event', (connection, transport) => {
-      const eventArgs = { arg: 'value' };
+      const eventArgs = [ 'value' ];
 
       const sendSpy = chai.spy((data) => {
         const packet = jstp.parse(data);

test/unit/remote-proxy.test.js

@@ -20,7 +20,7 @@ describe('RemoteProxy', () => {
     emitRemoteEvent() { },
 
     processEventPacket() {
-      proxy.emit('testEvent', 'payload', true);
+      proxy._emitLocal('testEvent', ['payload1', 'payload2']);
     }
   };
 
@@ -64,22 +64,22 @@ describe('RemoteProxy', () => {
   it('must emit events through the network and locally', () => {
     const handler = chai.spy();
     proxy.on('testEvent', handler);
-    proxy.emit('testEvent', 'payload');
+    proxy.emit('testEvent', 'payload1', 'payload2');
 
     expect(eventSpy).to.have.been.called.exactly(1);
     expect(eventSpy).to.have.been.called.with(
-      'testInterface', 'testEvent', 'payload');
+      'testInterface', 'testEvent', ['payload1', 'payload2']);
 
     expect(handler).to.have.been.called.exactly(1);
-    expect(handler).to.have.been.called.with('payload');
+    expect(handler).to.have.been.called.with('payload1', 'payload2');
   });
 
   it('must not re-emit events back', () => {
     const handler = chai.spy();
     proxy.on('testEvent', handler);
     connectionMock.processEventPacket();
 
-    expect(handler).to.have.been.called.with('payload');
+    expect(handler).to.have.been.called.with('payload1', 'payload2');
     expect(eventSpy).to.not.have.been.called();
   });
 });