CssSorter: Handle linebreaks (fixes #601).
* Originally fixed by madskristensen/CssSorter#10
* Updated assembly.
ImagePaste: Filter rich-text in OLE.
Fixes #608.
NodeExecutor: Overwrite after post-processing.
Fixes #599 & #612.
Helpers: Avoid duplicate inclusion (#618).
Compiler: Skip unobtrusive files (fixes #545).
Merge pull request #610 from am11/master

Misc. bug fixes