manually install php7-redis extension that is no longer available as a package

best of php7.1 branch and still using php7.0 because of breaking changes

add start.sh

add dockerfile, remove /etc from dockerfile

remove unneeded files and add readme

adding license and .gitignore

adding php pdo to apk to clearup missing dependency

updating to use alpine 3.5

tweak apcu installation, clean up temp files

Adding phpt-apcu

minor dockerfile cleanup

cleaning up config for cleaner Dockerfile

installing php7 opcache, fixing some moved apk packages

installing php7-pdosql

removing unneeded env variables