Fix typo in variable name

Shell variables are case-sensitive.
Merge pull request #70 from mgedmin/patch-1

Fix typo in variable name
Fix the services names of redis and supervisor.
In Debian and Ubuntu, the service name for MariaDb is mysql
Verify if it is Debian or Ubuntu distributions and start all necessar… …
Add package libjpeg-turbo8, in the line where install all prerequisites
update from frappe master
update from frappe master
Merge remote-tracking branch 'origin/develop' into develop