Json object replace enhancements and mocha tests

[sseide]

I converted all tests from your test.js to mocha and added a lot more for different cases. They can be removed from the test.js now.

Then i updated the mask json method to remove many of the know limitations from the readme:

• Only one is allowed per field. Either `ARRAY[].FIELDorJSON.*`
• It will not work for the nested fields like ARRAY[*].FIELD1.FIELD2
• It will not mask all array elements if given ARRAY[*] or ARRAY[*]

I added test cases for the new behaviour too.

Can you please check booth PR and merge them creating a new version afterwards?

Thanks in advance, S. Seide

[Sumukha1496]

Hi @sseide , Thank you for the contribution. I will go through the PR and get back

[sseide]

Hi @Sumukha1496 - do you found some time to review it? I'd like to use this in my project too and need to wait for the official release from you... And there is the other PR #28 open improving a lot of other test cases in mocha and implementing the missing ones from your old test.js

Many thanks