Merge branch 'release/2.3.0' into develop
Adjust CSS and JS Compession
Adjust S0 serial listener, improve foreground mode
Adjust API and split into more maintainable files
Add status mail script
Add OpenWeatherMap template and script for storing weather data
Adjust several scripts
Several fixes for PHP 5.5.*
Make Index charts view single page, no reload for load, delete or save of charts
Adjust Nginx server definition template
Rename Yield class for PV-Log, yield is reserved since PHP 5.5
Minor fixes
v2.4.0 release
v2.4.0 feature release