Summary: Freshly init-ed plugins are not picked up by Flipper if they are not on the search path. This diff checks if the current dir is on the search path, and, if not, suggests to add it.
Reviewed By: jknoxville
Differential Revision: D21619632
fbshipit-source-id: b1dbe2695dbee9ce537999dc83e36f969ba4b747