Add JC_Button to keywords file so that syntax highlighting works on #…

…include statement. Closes JChristensen#25.

Closes JChristensen#22.

Add ToggleButton derived class.

Fix constructor initializer list order. Closes JChristensen#14.

Typo in README file.

Rename library & repository from Button to JC_Button.

Add library.properties file.

version 1.0

Alpha v0.9