Added instvar contents to Markup

It somehow went missing :|
Load gossip/Gossipdoc.st on startup
Removed file header and modified class comment
Rewrote #createInFolderNamed: to use HTMLMarkup

Moved #initialize to the top of the file
Added #fileNameForClass: and #fileNameForMethod:inClass:
Fixed #createInFolderNamed:
Rewrote #createForClass: to use HTMLMarkup
Extracted Gossipdoc>>#createForMethod:inClass: from #createForClass:
Naming fixes
Inlined Gossidoc>>#selfCreateForMethod:inClass: sends
Fixed Gossipdoc>>#fileNameForClass:
Fixed missing period in Gossipdoc>>#createForClass
Replaced tabs with spaces
Fixed Gossipdoc>>#fileNameForMethod:inClass: