Fix possible double slashs when dynamicPublicPath

[mathieutu]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Hi,
Thanks for this package!

I'm in a situation where a tool I can't control set my publicPath from config, and add a / to it. In fact webpack recommends to do that:

The value of the option is prefixed to every URL created by the runtime or loaders. Because of this the value of this option ends with / in most cases.

However the HMR path also starts with a /, and all the default paths and example of this package!

With theses both slashes, when in case of dynamicPublicPath: true, we end to a publicPath//path path.

This little PR just fixes that by replacing all // with / in the paths concatenation.

Thanks,
Mathieu.

[jsf-clabot]

All committers have signed the CLA.

[mathieutu]

Circle fails for a reason which seems not related to this PR.

[alexander-akait]

@mathieutu Sorry for delay, can you add test case?

[mathieutu]

Sorry, but it has been more than two years, and I'm not using the project anymore.

I'll try to take a look, but if someone wants to tackle it, feel free!

[bjohansebas]

webpack-hot-middleware is being migrated into webpack-dev-middleware — see webpack/webpack-dev-middleware#2322.

This is handled there by webpack/webpack-dev-middleware#2348.