Create a more robust interface with TOML object

[PMunch]

With the possibility to output TOML it makes sense for people to create TOML with this package. As of 17c6c51 I've added set and add procedures for the basic types, and an iterator to array types which is able to manipulate entries. But I feel like this interface could be improved upon a lot. Maybe look at how the JSON module is handling this? Having TOML be as easy to use as JSON would greatly improve how usable this module is.

[PMunch]

Tried to copy the JSON interface in #19, thoughts?

[kaushalmodi]

@PMunch Looks like this can be closed?

[PMunch]

Yeah.. I was thinking of discussing the pros and cons of the two interfaces, but @data-man went ahead and merged it in 😛 So I guess we can close this issue now.