Fix getCurrentURLPath error and provide ability for named regex group replacement in generate method

[MatthewJohn]

Reverted 0aed88e as this was causing errors, both in tests and in real usage:

Uncaught ReferenceError: getCurrentURLPath is not defined

Added ability to replace regex groups (that are using named regex groups) in path, e.g:

    router.on({
        '/example/(?<name>.*)': {
            as: "TestRoute",
            uses: function ({ data }) { }
        }
    });

    router.generate('TestRoute', {name: 'myname'}, {replaceRegexGroups: true})
    > '/example/myname'

Disclaimer: I'm not too used to npm/yarn and how builds are generally performed for this type of project - I had to do some mangling to be able to build (during which some packages got updated), so I didn't include in this PR, but have committed them to https://github.com/MatthewJohn/navigo/tree/fix-build - apologies in advance!