v0.11.1
Fixing `make release` to also cover package.json.

Per https://github.com/creationix/nvm/commit/a3de7f322233ab2b17ad6a69ea56877e417057cd#commitcomment-7057689
string replacement turns out not POSIX compliant
Merge pull request #479 from koenpunt/fix-args-replacement

string replacement turns out not POSIX compliant
Fix curl/wget detection. Fixes #478
If `nvm_ls` is called without a pattern, and node exists, tack on "system".
Add `system` support to `nvm_print_versions`
`nvm use system` should work as expected.
Add nvm_tree_contains_path function
If nvm is deactivated, display "none" or "system" instead of the system node version
Fixing the `nvm current` tests, and adding a slow test, since it needs an installed version of node.
Making this test failure message more useful