Use 'ObjectPath' package for dot (period) support

[A-312]

I will make a PR to add ObjectPath package like dependencie. This dep looks reliable : https://github.com/mike-marcacci/objectpath/blob/master/test/index.js

Example :

> var ObjectPath = require('objectpath');
undefined
> ObjectPath.parse('a[1].b.c.d["e"]["f"].g');
[ 'a', '1', 'b', 'c', 'd', 'e', 'f', 'g' ]
> ObjectPath.parse('a[1].b.c.d["e"]["www.site.com"].g');
[ 'a', '1', 'b', 'c', 'd', 'e', 'www.site.com', 'g' ]
> ObjectPath.parse('a[1].b.c.d["e"]["www.site\\".com"].g');
[ 'a', '1', 'b', 'c', 'd', 'e', 'www.site".com', 'g' ]
> ObjectPath.parse('a[1].b.c.d[\'e\']["www.site\\".com"].g');
[ 'a', '1', 'b', 'c', 'd', 'e', 'www.site".com', 'g' ]

Similar
#250, #271, PR #315

[A-312]

@madarche is it right for you? Can i use ObjectPath?

We will able to do conf.get('a[1].b.c.d["e"]["www.site.com"].g') :)