0.0.4

• gly fy: converts gabc to gly
• \markup keyword - verbatim text or LaTeX code to be included in the preview
• support gabc header field nabc-lines (don't comment it out in generated gabc)
• preview by default annotates scores by their id header value
• allow empty header fields
• block variant of \lyrics and \music keywords
• support for all gabc divisiones and hard line breaks (handled as "non-lyrical" music chunks)
• preview: format of placeholders in the document template changed to the django/jinja/... standard - e.g. {{glyvars}}
• tested documents containing adiastematic nabc notation
• preview: die loudly on error of the subordinate latex process
• preview: when input file doesn't exist, try to add extension - e.g. gly preview hello compiles hello.gly if file hello doesn't exist