Fixed occasional multilang lexer crash when getting lexer name; LexLPeg.cxx
Ensure Markdown does not fold by indentation; lexers/markdown.lua
Markdown loads the hypertext lexer, which in turn loads CoffeeScript, which
turns on folding by indentation. Revert it.
Respect `fold = 0` property; lexers/lexer.lua
Updated D lexer from Brian Schott; lexers/dmd.lua
Added Nimrod lexer.
Allow embedding of child lexer with multiple start/end tokens; lexers/lexer.lua
Include fallback rule in all grammars by default.
The explicit 'any_char' rule is no longer needed.