Update BrowserExploitServer for JSObfu
Update rspec
Last changes
Fix os detection rspec

no more window
Update js_obfuscate
Chagne option description
Default to 0
Update js_obfuscate
upate doc
Move jsobfu to a mixin
avoid saying 'should'
Fix a typo

Downloading and deleting are two very different things. Thanks Dan.
Land #3840, @wchen-r7's tweaks to os.js and module addition.
Land #3843, typo fix for download_file