Bug fixes, support v8 flags!

Fixed a magnitude of bugs in the past 6 releases.

• nexe now searches up to 4 top level directories for browserify, fixing most dependency issues.
• nexe can now hard code v8 flags with nexe.compile and the package.json method.
• nexe now can understand a few various errors, and explain them.
• Much more verbose logs for future issues
• v8 flags works for 0.12.0 and 5.5.0 confirmed. Most should work as well.