Bug fixes and random functionality

• bug: pyliter.document.PythonDocument line numbers always start zero
• bug: pyliter.document.PythonDocument line count off by one
• feature: preview command line flag now honored
• feature: transparent flag forces background color transparent

Syntax highlighted Python rendered to PNG files

1.1.0

1.1.0

Syntax highlighted text with ANSI escape codes

0.1.3

0.1.3