Allow paths with spaces.
The Windows version of tar doesn't play nicely with pipes. This way is more cross-platform.
Merge pull request #604 from Veered/master

Make wp-cli more Windows compatible
add comment about cURL + tar. see #604
add --locale parameter to 'wp core config'. fixes #607
clone object instead of calling constructor; fixes #592
add comment above apparently unnecessary load_command() call
move find_command_to_run() method to WP_CLI\Runner

the WP_CLI class should be a simple facade, with only public methods
show synopsis for incomplete commands, even without a WP install
extract init_config() helper method
Merge pull request #603 from wp-cli/fix-603

`wp core` should work without a WP install
merge master into multisite-install branch