Add css-will-change-1.vim and test

See Also: http://www.w3.org/TR/2014/WD-css-will-change-1-20140429/
Add view-mode.vim and test.

Reference: http://www.w3.org/TR/2012/REC-view-mode-20120619/

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>