Usability updates to README
Restart php5-fpm after disabling xdebug in provisioning

On a default instance of VVV, xdebug is still enabled because we don't restart php5-fpm after disabling the xdebug module. This commit modifies that to restart php5-fpm immediately after disabling the xdebug module.
Remove the included copy of PHPMemcachedAdmin

We should be able to download this during provisioning the first time rather than including so much code that isn't ours with our repository.
Download PHPMemcachedAdmin during provisioning with wget if not available

Downloads a copy of PHPMemcachedAdmin during provisioning if the directory for memcached-admin does not yet exist, extracts that copy, and then cleans up.

Also modifies gitignore to ignore the entire memcached-admin directory now rather than just the temp files.
Add comments for phpMemcachedAdmin installation
Remove config.ssh.timeout due to backward incompatibility with Vagrant 1.3.0

Vagrant 1.3.0 eliminated some configuration options, config.ssh.timeout being one of them.

Not going to replace with anything at the moment, we'll see if there is a need to set the general vm timeout at a later time.
Adjust drive mounting options for Vagrant 1.3.0 compatibility

Vagrant 1.3.0 no longer supports the `:extra` flag and uses `:mount_options` with an array of values instead.
Use Vagrant 1.3.0
Merge pull request #144 from NCTA/master

Usability updates to README
Update contributors list
Merge branch 'master' of https://github.com/10up/varying-vagrant-vagrants
Merge branch 'master' of https://github.com/simonwheatley/varying-vagrant-vagrants