Update README.markdown

I do think recent changes changed nvm to .nvm.
Fixes issue 232

Fixes issue 232 that occurs in at least bash v4.2.25 where "nvm ls" returns "N/A" no matter how many versions of node have been installed.  The fix uses a combination of the find, tr and basename commands instead of basename only.  Tested in bash v3.2.48 and v4.2.25 and zsh v4.3.11.
Update README.markdown
Merge pull request #243 from lgw4/master

Changed git download protocol from git:// to https:// to work around firewalls.
Fix the 'nvm deactivate' test

`nvm deactivate` does not really remove the nvm command, it just remove
the entries from $PATH and $MANPATH previously adde with `nvm use`.
Fix the setup/teardown urchin test scripts under zsh

The v* glob expansions were failing with an error under zsh, just set
nullglob/NULL_GLOB and make both bash and zsh happier.
Updated fix for issues #232 and #244

Fixes issues #232 and #244 where "nvm ls" returns inconsistent results depending on the number of node versions installed.  This updated fix uses the find and sort commands only.  Tested in bash v3.2.48 and v4.2.25, and zsh v4.3.11.
Merge pull request #229 from em-/testsuite-fixes

Testsuite fixes
Merge pull request #236 from donovanjamesking/master

Fixes issue 232 and "nvm ls" returning "N/A" when it shouldn't
Install script no longer depends on git to be installed.

Also fixed a bug where a literal "\n" would be injected into the bash profile.
Moved gitless installer into its own file.
Fix newline issue in install.sh
* Using raw.github.com instead, downloading only nvm.sh
* tar no longer required
* TARGET was not converted to DIR
* NVM_TARGET renamed to NVM_DIR (this will ensure that any locally
* existing nvm copy will be picked up and updated)
Merge pull request #250 from ronkorving/gitless

Git-less installation script
Merge pull request #251 from stelcheck/NVM_DIR

* NVM_TARGET renamed to NVM_DIR
Merge pull request #238 from shibukawa/patch-1

Update README.markdown
Merge pull request #219 from techdives/patch-1

Update README.markdown
Updating ~/nvm to ~/.nvm