Added a more appropriate error message for the new npm command.
Removed an empty echo which would interfere with last error variable.
Prompt the user to symlink basil to /usr/local/bin or not.
Remove some superfluous error checking.
Don't remove `which basil` until we overwrite it.
Allow bin/basil to be called either directly or via a symlink.
Merge branch 'non-local-install' of https://github.com/shteou/devkit into non-local-install

Conflicts:
	bin/basil