Version 5.1.0

• Improved timemap with grace notes and arpeggios
• CSS scoped to the specific MEI document based on mei@xml:id
• Option --ligature-oblique for controlling ligature shape (curved or straight)
• Fix handling of -p and -a options regarding MEI output (@brdvd)
• Fix Cocoapods building (@rettinghaus)
• Fix rendering of neumes rendered as notes