Added wildcard to root rm

I add timeout. In case of failure, logram will not freeze the OS startup.

refactor installation script

Check if systemd log2ram service is running before the install;

Linked to the #30 error

#46

better for flexible shell

typo for #32

Suggestion from #46

minor improvements to the readme

minor improvements to the readme

Added logrotate support

install: Fixing code typo

The last bracket shall not be glued to the directory.

The actual code is generating a runtime error like the following :
 erwan@raspberrypi:~/download/log2ram $ sudo ./install.sh
 Created symlink /etc/systemd/system/sysinit.target.wants/log2ram.service → /etc/systemd/system/log2ram.service.
 ./install.sh: 19: [: missing ]
 ##### Reboot to activate log2ram #####

This patch simply adds the missing space to make this script work.

Improved readability of the readme and comment in the config file

Added:
- check on install
- clear old folder on install
- better uninstall script
- use systemctl instead of manually call script in the cron