Upgrade node-expat to 2.1.4

[maherbeg]

This will allow compiling xml2json on newer versions of Node, such as v0.11.x and above.

I ran the existing tests and they all pass.

[xml2json: array-notation.xml->array-notation.json] passed!
[xml2json: coerce.xml->coerce.json] passed!
[json2xml: domain-reversible.json->domain.xml] passed!
[xml2json: domain.xml->domain.json] passed!
[xml2json: large.xml->large.json] passed!
[xml2json: reorder.xml->reorder.json] passed!
[xml2json: spacetext.xml->spacetext.json] passed!

[calvinfo]

Sweet, this worked for me. Any chance you can bump and push to npm?

[c4milo]

I just published version 0.4.0 which includes this PR as well as some others. I would suggest testing thoroughly before upgrading production systems.

[calvinfo]

Thanks! I'll give it a shot and let you know if we run into problems.