upgrade to lodash 4.17.4

[rflament]

Lodash 4.x merge function does not take customizer function as the third argument anymore :

https://lodash.com/docs/4.17.4#merge

Instead we have to use the function mergeWith

That's problematic when a dependency other than node-soap requires lodash 4.x : lodash 4.x ends up being used and wsdl inclusion does not work anymore.

This pull request switches to lodash 4.17.4 and use mergeWith function to fix this.

[coveralls]

Coverage remained the same at 93.191% when pulling 10c7990 on rflament:master into 94a8b54 on vpulim:master.

[jsdevel]

please fix the code so the tests pass

[herom]

@jsdevel the test which are failing are the ones that we merged in with #933

@rflament could you please rebase your branch so that it's on par with the latest master (with #937 merged in) - the test should pass afterwards 👍

[coveralls]

Coverage remained the same at 93.215% when pulling 189af72 on rflament:master into d3f9875 on vpulim:master.

[jsdevel]

closing due to inactivity