Release v1.1.5

• bug-fix remove unnecessary return in button configuration leading to service not working anymore
• modify default configuration to use dimming
• replace main loop pass with sleep to reduce process load
• increase PWM frequency to 400 (one of Raspi's standard values)
• add some more log output
• add scripts for install/reconfigure/update/uninstall
• update README.rst to cover script installation
• update copyright years