collapse the ignoreMissing logic
re-enable the sometimes failing multi entry test
use the npm version of timers-browserify
Update native-buffer-browserify to 2.0.0 for IE6-8 support

See: https://github.com/feross/native-buffer-browserify/issues/7
Revert "use the npm version of timers-browserify"

This reverts commit 50128d57daad6a79e5c58ad8594f5ba6702bc98b.
upgrade insert-module-globals to get native-buffer-browserify 2.0.0
3.15.0
Merge branch 'master' of github.com:substack/node-browserify