Revert to browserify v7.x
Revert to browserify v7.x

The logic for deduping in the v8+ code has proven to be very bug-prone.

e.g. https://github.com/substack/node-browserify/issues/1176
https://github.com/substack/node-browserify/issues/1173
https://github.com/substack/node-browserify/issues/1150

and specifically: https://github.com/substack/node-browserify/issues/1131#issuecomment-76392918

Reverting to v7 seems to fix many of these issues. The changes between
v7.1.0 and v9.0.3 (latest as of this commit) are trivial and do not
affect atomify-js functionality. This reversion should allow atomify-js
to work better with complex while costing very little (maybe nothing)
lost browserify functionality.

atomify/atomify-js