fix #130 with proper syntax & on master branch

[maxleiko]

Hi there,

I've fixed #130 as you did in this commit but using Object.defineProperty instead of __defineGetter__.
Also, you've fixed it in branch gh and did not publish any nconf version on the npm registry with this patch. Do you plan to merge this PR and publish nconf in a near future?

[maxleiko]

@indexzero any chances?

[indexzero]

Thanks for the contribution!

There are quite a bit of changes here. Would be happy to accept the PR for just the browserify support if you'd like to decouple them.

[maxleiko]

@indexzero, in the end I've started my own config module tiny-conf as I needed the pluggable architecture in order to minimize bundled size & browser compat.

To be fair, my default storage is in-mem and is pretty much a copy/paste of your Memory store 👍