[v1.7.2] experimenting multilingual ppost

merge v1.7.1-sw

improve code>pre style to fixed issue#15

merge from rpsh pull-request, add disqus

make Duoshuo/Analytics configurable, fixed about-page Duoshuo thread-…

…key missing, add GA and Drop QQ Analytics, ready to update documents

fixed Grid System, draw out side-container from post-container

font-family big improve

font-family big improve

update README, not sure if github support <video>

V1.2, release keynote layout