Add support for configuration of rsync options

[thhermansen]

I have set up k8sync for a Ruby project which runs Gard and the syncing of files works fine.

However, most of the time the sync of files does not trigger Guard to rerun the relevant tests. I found a couple of issues which seems related in Guard: guard/guard#794 and guard/listen#350.

The comment guard/guard#794 (comment) and guard/listen#350 (comment) seems relevant which requires us to pass --inplace to rsync.

I suggest we make the args around here

k8sync/lib/Sync.ts

Lines 36 to 43 in 4d34ae5

	const rsyncArgs = [
	'--recursive',
	'--links',
	'--executability',
	'--times',
	'--compress',
	'--delete-after',
	]

configurable so we can add additional options per sync in the config file.

[thhermansen]

I tested https://github.com/Skalar/k8sync/compare/inplace-flag. It works and makes guard detect changes :)

[thhermansen]

Do we wanna have this option explicit in the config (like it is in the test-branch), or do we want to extend the config so we can pass arbitrary options to syncing lib rsync?