Merge pull request #502 from heidiso/develop

SWC-768 Escaping backticks/underscores for Synapse Processor
SWC-767: default css class for code element is no-highlight
Merge pull request #503 from jay-hodgson/SWC-767

SWC-767: default css class for code element is no-highlight
fix test
Merge pull request #505 from jay-hodgson/SWC-767

fix test
SWC-773 [Markdown] add support for lists within blockquotes
Merge branch 'swc_773' into develop