Make syntax highlighting for markup languages start from the beginning.

HTML seems to be the big offender here, especially when JavaScript is
embedded into the page.
Treat leinrc as a shell script.
Merge branch 'fix-markup-syntax' of https://github.com/jszakmeister/vimfiles
Merge branch 'treat-leinrc-as-sh' of https://github.com/jszakmeister/vimfiles