add CUSTOM_ARGUMENTS_JSON_CHECK, improve CUSTOM_ARGUMENTS_JS_CHECK

[phosphore]

After @ikkisoft's review of #42, I reflected the blacklist approach of CUSTOM_ARGUMENTS_JSON_CHECK to CUSTOM_ARGUMENTS_JS_CHECK.

This pull request definitively resolves #22 and also fixes a typescript bug found on CUSTOM_ARGUMENTS_JSON_CHECK.

I also wrote tests and updated the wiki accordingly:

• https://github.com/doyensec/electronegativity/wiki/CUSTOM_ARGUMENTS_JS_CHECK
• https://github.com/doyensec/electronegativity/wiki/CUSTOM_ARGUMENTS_JSON_CHECK