Update nvm.sh

fix#https://github.com/creationix/nvm/pull/330

fix https://github.com/creationix/nvm/pull/330

Added command to get current nvm environment.

Update README.markdown

Fix - this line should be nvm use 0.10 - no 'v', and no incremental version number.

small fix fo nvm help info

fix copy-packages in zsh (without breaking sh and bash). Closes #223, fixes #299.

fix copy-packages

helper method for testing existence of commands

Slurp stderr from  test unsetopt

Universal test of unsetopt command. Closes #300

According to http://stackoverflow.com/a/7522866/189431 it should work in "bash, zsh, ksh and sh (as provided by dash)".

For zsh users

Fixed bash error caused by lack of double quotes

Properly remove the tar file.

i use zsh and i did this update in install.sh local, is good for you too :)

install.sh: use a more generic SOURCE_STR

SOURCE_STR currently includes the value of $HOME (at install time).
Change SOURCE_STR to include a literal "$HOME" (to be expanded at
profile runtime) so that sourcing nvm will work if the user changes
their username, shares their profile, et cetera.

Also use the more portable single-square-bracket test.

Add check for git in the installer script.

Finds NVM_DIR with `cd -q` on zsh

Under Zsh, the `-q` flag to `cd` makes it not run `chpwd` hooks and hence makes it not add `~/.nvm` to `autojump`.

Using `cd` makes the nvm directory the number-one directory in `autojump`'s database---which is somewhat confusing since the user basically never `cd`s to it directly!---so here's an alternative method that doesn't use the `cd` command. I've checked it works in both Bash and Zsh.