Gzip and delay

Thanks to @soliveira-nascent AMP now supports gzip compression and adding artificial delays to the proxy endpoints.

Fix data folder resolution issue

Relative dataRoot paths, like the the default data are now resolved relative to the CWD, rather than the module folder.

Initial Release

Almost a complete rewrite of the tool this was originally forked from. Still provides the same basic functionality, but with broader method support, better customization options, and an update ES2015 code base. Requires node >= 5.