[5.2] Adding postgres specific operators for jsonb type

[melanholly]

I was trying the features of Postgresql 9.5 and foundout that Eloquent does not support a couple of operators. Here I am adding the operators:

Operator	Right	Operand Type
@>	jsonb	Does the left JSON value contain the right JSON path/value entries at the top level?
<@	jsonb	Are the left JSON path/value entries contained at the top level within the right JSON value?
?	text	Does the string exist as a top-level key within the JSON value?
?		text[]
?&	text[]	Do all of these array strings exist as top-level keys?
-	text	Delete key/value pair or string element from left operand. Key/value pairs are matched based on their key value.
-	integer	Delete the array element with specified index (Negative integers count from the end). Throws an error if top level container is not an array.
#-	text[]	Delete the field or element with specified path (for JSON arrays, negative integers count from the end)

Reference -> http://www.postgresql.org/docs/9.5/static/functions-json.html

[melanholly]

I've fixed so errors but I can't understand how to fix the mockery tests problems. It seems that the mocked class does not have the method. I am missing something serious here.

[GrahamCampbell]

Please update the tests, and add new tests to cover what you've added.

[melanholly]

I've fixed the possible issues. I am not so sure about the testing but i should cover the basic concept of using the operators for postgres. If you have any ideas about the testing that I can implement, please share them so I can make this pull request better.