Adding full support for longs/negative long values

[calvinfo]

I copied most of the parts of the methods which seemed still applicable instead of re-writing them entirely. I think its okay since most of it was generated by the script in the first place.

This thread gives you a decent idea of what javascript can support in terms of precision:
http://stackoverflow.com/a/307200/883795

Seemed to work for random ranges of positive and negative longs that I tested with. You might want to change the parser back to BinaryParser.toLong, but that is up to you. I think it does not exactly work with the new format, but I'm not sure.

Can you pull the counter column pull request in Helenus with this change?

Thanks!

[calvinfo]

The issue is also referenced here:
https://issues.apache.org/jira/browse/THRIFT-1497

There's a problem representing anything larger than 2^53 in Javascript, but it looks like there's a request for it to be patched upstream using this library: https://github.com/broofa/node-int64.

Any thoughts? I'd like to see counters in helenus, though none of my counters involve anything needing 53 bits of precision.