Fix background of line number view (fix #202)
Fix applying line endings (fix #201)
Use settled font for invisibles
Disable save dialog if content is empty
Suppress save alert only if document is not saved (close #203)
Merge branch 'feature/issue203_suppressSavingAlert' into develop
Fix cursor color in some themes
Add "SQL" syntax style
Merge pull request #204 from coteditor/feature/fixInvisiblefont

Use settled font for invisibles
Add "Go" syntax style
Add "Lua" syntax style
Rename some variables
Update "Ruby" syntax style (close #191)
Clean up change log
Add Go, Lua and SQL to document type
Refactor around syntax edit sheet
Migrate cell-based table veiws in syntax edit sheet to view-based (ref #155)
Migrate a cell-based table view to view-based (ref #155)
Avoid using awakeFromNib method as possible
Use weak self in blocks