add space-style as pre
encode HTML before show code content
debug - missing last kept cnt
line style adjust
split getDiff to getLinesDiff & getInlineDiff
adjust code structure
Merge remote-tracking branch 'shao/master' into client
adjust block height
diffBlock uses empty string while inited with no content
update diff-merge & use participle instead of char-by-char while getting inline diff
Merge pull request #8 from nighca/client

debug & optimize code diff