Update lcd_adj.py

Add support for 16x1 LCD display. Auto search I2C adress for PCF8574. Add pressure info from pressure plugin.
Update pressure_adj.py

Add into web pressure_adj.html checkbox  inversion state for the pressure sensor (open / closed). Add support for LCD plugin (def get_check_pressure() ). Change GPIO pin to pin 12 (GPIO18) for hardware change my PCB.
Update pylcd2.py

Disable blink cursor on LCD.
Create system_info.py

New plugin print information from OS (raspeberry PI).
Update lcd_adj.html

Add support for 16x1 LCD, autodetect I2C.
Update pressure_adj.html

Add checkbox for sensor type: open/close. Change GPIO pin to pin 12(GPIO18) for my new hardware PCB.
Create system_info.html

Add new plugin system info for system information (RAM, MAC....)
Merge pull request #36 from martinpihrt/master

update and new plugin