Added support for setting/deleting breakpoints at run-time.
Updated coroutine debugging to avoid using `require` calls.
Fixed STEP command broken by run-time breakpoint changes (fixes #12).
Updated handling of `os.getenv` that may return multiple values (fixes #13).
Added DONE command to stop debugging and continue execution.
Added `pause` method to suspend debugging from the application.
Moved closing debugging connection after responding to the controller.
Updated README for 0.56.
Fixed compatibility with Lua 5.2 (#13).
Added line mapping support for debugging Lua-based languages.
Added path processing for chunk names that look like file names.
Minor updates to README.
Fixed localizaton in breakpoint handling function.
Added support for nginx debugging using internal coroutine API.
merged with new features.  havent checked that it worked yet