Description of problem:
When I try to load a task form in an external web app using the new form-modeller's javascript api, I get HTTP 404 instead of relevant error message.

The whole problem seems to be that unlike the "showStartProcessForm" function, which appends "/" to hostUrl in case it's not present, the method "showTaskForm" leaves the url as it is.

Version-Release number of selected component (if applicable):
BPMS 6.1.0 DR1

How reproducible:
Always. 

Steps to Reproduce:
1. When using the jbpm-forms-rest-integration.js api to load a task form, 
use URL of the form "http://localhost:8080/business-central"  (i.e. without "/" at the end) as hostUrl parameter of "showTaskForm" function.

Actual results:
HTTP 404 - is returned from the server

Expected results:
The response should load the form or show proper error message with stack trace even for urls without "/" (as is the case of showProcessStartForm)

Additional info:
See:
https://github.com/droolsjbpm/kie-wb-distributions/blob/master/kie-wb/kie-wb-webapp/src/main/webapp/js/jbpm-forms-rest-integration.js

To fix this you should add a line like this to showTaskForm function:
if (hostUrl.charAt(hostUrl.length -1) != "/") hostUrl += "/";