ArrayHandler and StringHandler interface

[eborden]

Arrays and Strings can share some common ground in implementation details. For in reality a string is just a list of characters. This means many Array methods would have common application on strings.

ArrayHandler and StringHandler should share a common interface of ArrayLikeInterface. I'll put together a pull request for illustration.

[eborden]

By unifying these two APIs with an interface we decrease complexity in the often common verbiage we use to affect strings and arrays. IE has/contains, count/length, etc.