vim-patch:7.4.397

Problem:    Matchparen only uses the topmost syntax item.
Solution:   Go through the syntax stack to find items. (James McCoy)
            Also use getcurpos() when possible.

https://code.google.com/p/vim/source/detail?r=v7-4-397
Merge pull request #1279 from splinterofchaos/matchparen

vim-patch:7.4.397