Fixed documentation error with R examples. Fixed bug when trying to load non-existent definition file.

build.gradle

		}

		-version = '1.2.0'
		+version = '1.2.1'
		applicationName = 'scrivenvar'
		mainClassName = 'com.scrivenvar.Main'

src/main/java/com/scrivenvar/MainWindow.java


		private DefinitionSource createDefinitionSource( final String path ) {
		- final DefinitionSource ds
		- = createDefinitionFactory().createDefinitionSource( path );
		+ DefinitionSource ds;

		- if( ds instanceof FileDefinitionSource ) {
		- try {
		- getSnitch().listen( ((FileDefinitionSource)ds).getPath() );
		- } catch( final IOException ex ) {
		- error( ex );
		+ try {
		+ ds = createDefinitionFactory().createDefinitionSource( path );
		+
		+ if( ds instanceof FileDefinitionSource ) {
		+ try {
		+ getSnitch().listen( ((FileDefinitionSource)ds).getPath() );
		+ } catch( final IOException ex ) {
		+ error( ex );
		+ }
		}
		+ } catch( final Exception ex ) {
		+ ds = new EmptyDefinitionSource();
		+ error( ex );
		}

src/main/r/README.md

		Definition file variables are have the ability to reference other definitions. Try the following:

		- `r#x( v$editor$examples$math$x )`
		- `r#x( v$editor$examples$math$y )`
		- `r#x( v$editor$examples$math$z )`
		+ x = `r#x( v$editor$examples$math$x )`;
		+ y = `r#x( v$editor$examples$math$y )`;
		+ z = `r#x( v$editor$examples$math$z )`

		The preview pane shows:

Delta	17 lines added, 11 lines removed, 6-line increase