Fix for browser cache on static files

Updated web server location to standard dir

Pinned tag at 1.10.1

Squashed commit of the following:

commit 5bfa5fc
Author: Mark Shust <mark@shust.com>
Date:   Wed Apr 20 10:04:21 2016 -0400

    Updated README

commit fdef43a
Author: Mark Shust <mark@shust.com>
Date:   Tue Apr 19 15:43:12 2016 -0400

    Hard-coded WWW_DIR to /srv/www

commit cec47fa
Author: Mark Shust <mark@shust.com>
Date:   Sun Apr 17 22:33:14 2016 -0400

    Moved www directory into env var

commit 042eb0e
Author: Mark Shust <mark@shust.com>
Date:   Sat Apr 16 23:14:07 2016 -0400

    Updated perms for user/group www-data markshust/docker-magento#5

commit 917ac75
Author: Mark Shust <mark@shust.com>
Date:   Tue Mar 15 08:25:49 2016 -0400

    Updated README with new build tag, php-fpm to phpfpm

commit f98186b
Author: Mark Shust <mark@shust.com>
Date:   Tue Mar 15 08:12:13 2016 -0400

     Updates to run nginx as magento user markshust/docker-magento#5

Hard-coded WWW_DIR to /srv/www

Moved www directory into env var

Updated perms for user/group www-data markshust/docker-magento#5

Updated README to use www-data for remote mount

Add support for environment variables in nginx config #4

Added magento to www-user group, and vice versa. Updated README.