Cleanup codebase, create v1

[fiznool]

Thanks for a great port of the Github library.

I'm offering this PR to cleanup a few things in the codebase, to make them a bit more friendly to what a node.js dev would expect in 2016. Here's a summary of the changes:

• parse_reply renamed to parse.
• String.prototype is no longer augmented, instead we use local functions for performing trim, chomp, etc.
• The module is exported directly, meaning you get the whole module when you require('emailreplyparser').
• Test dependencies added to package.json to make testing easier.
• underscore replaced with lodash in the tests.
• Code style cleaned up: use single quotes everywhere, add 'use strict' definitions, use triple equals where necessary.

I hope this is acceptable, if not then I'm happy to maintain my fork and publish to npm under a different name.

[CTassisF]

@fiznool Did you fork and publish to npm under a different name?

[fiznool]

@CTassisF the changes are still in my fork at https://github.com/flowxo/emailreplyparser

I didn't publish anything to npm yet. If @mko doesn't reply in the next few weeks I'll look to do that. In the meantime you can depend on my fork directly. In your package.json:

"emailreplyparser": "github:flowxo/emailreplyparser#0834875