Eio 1.7.0

Changes since Eio 1.0.0:
-------------------------

Additions:

Fixes:
	- build out of tree.
	- detect when requesting to monitor a different file with the same name.
	- memory leak when shutting down fallback monitor.
	- properly shutdown monitor.
        - Fix segfault when shutting down the Windows monitor.
	- Fix memory leak when using file_associate.

Improvements:
	- Add log debuggong macros

Removal:
