Fixed a bug on router/path
Fixed a bug on router/path

- Stored the args length on a variable instead of three consecutive calls to the len method on "toStringSlice" function;
- Improved readability on "toStringSlice" function;
- Fixed a bug on "URL", which all routes without parameters would not return the full uri (just the path);

Former-commit-id: 3ddd8869087aa9046bdb874f98985b76daaa249e
kataras/gapi,kataras/iris,kataras/iris,kataras/gapi,kataras/iris,kataras/iris