use routePath instead of fullPath in add method

[crisperpo]

Hi there,

We have been using Grapnel router in our project, and it works really well for our requirements, so we want to keep using it.

However we have had an issue when upgrading the library from version 0.6.4 to 0.7.2 because the router.get method does not bind the specified path pattern to the given function. It only works as expected for the wildcard '*'.

So the following works as expected and myHandler gets fired for the wildcard '*':

const router = new Grapnel({ pushState: true, root: MY_ROOT })
router.grapnel.get('*', myHandler);

For any other path pattern value different than '*' however the handler is never fired. For example:

const router = new Grapnel({ pushState: true, root: MY_ROOT })
router.grapnel.get('/:learningLanguage/:flowId', myHandler);

After doing some research we found out that the issue happens because of the following:

1. The add method is called by the get method

2. The route is created based on the fullPath value:

   let req = route.parse(this.path());

3. The root is removed from the route:

let req = route.parse(this.path());

4. The script checks if the route matches the pattern after removing the root:

   if (req.match) {

5. No matches are found so the function is not bound to the specified path

We found out that the solution to this issue is to use routePath instead of fullPath when creating the route as follows:

let route = new route_1.default(routePath);