Update LiquidCrystal_I2C.cpp

Update LiquidCrystal_I2C.h

Code cleanup: remove trailing whitespaces

Add missing return statement

Start of code documentation.

Remove unsupported API functions, don't really care about old sketches (muhahaha.)

Remove the call to backlight(), to demonstrate it is on by default.

Remove a include that seems bogus.

Add new example to demonstrate & test the cursor in blinking and non-blinking operation.

Forgot to rename the variables.

Fix coding style and synchronize the names of constructor arguments.

Compile error in example CustomChars, used print(x, BYTE) that is not deprecated in Arduino 1.0.

Change code format of the example files.

Explained how to install the library and include it in your project.

Change the extension of the examples from .pde to the new .ino