suppress `stderr` of `which` command output for compatibility with some `which` versions

update README

switch to find command from wildcard matching in nvm alias

fix missing test command for $version_not_provided

fix return status of nvm_version and nvm_remote_version

fix nvm alias return status

nvm 0.7.0 parity

fix nvm_format_version

Modify `nvm_print_versions` while loop to for loop

fix installation path error

nvm 0.5.1 parity

nvm use after installation

add LICENSE

add README

add install.fish