Added support for different LCD libraries

Added a template to the LCDGraph class to specify the library that will be used for driving the display. This library needs to be pretty similar to the built in LiquidCrystal library in terms of its api.

Also added a version of a constructor that leaves out the height parameter as it is set to 1 anyway.

Should be fully backwards compatible with the previous release. If not or there are other issues, feel free to create an issue.

Fixed up duplicate files and actually implemented the length method

Not sure what happened last time but there were duplicate files and it turns out I hadn't actually implemented a length()method. Should be fixed now.

Cleaned up a little and made length a method

v1.1.0

Cleaned up and made more object orientated like

Ready for use

First major release.