v0.6.6

• Added support of dynamic revision numbers, like 0.6.+. Concrete values still must be specified for the major and minor numbers of the Grain version -- declarations like 0+, 0.+ or 0.6+ won't accepted. This is done on purpose to ensure that a theme always uses compatible Grain version
• Fixed an issue when a value of the script header key was overwritten during parsing
• Added defaults for non_script_files site configuration option, see source processing