fix formatting error in blob.hpp
Add a leveldb option function in io.hpp/cpp
Merge pull request #904 from Yangqing/sweep

Add a leveldb option function in io.hpp/cpp
[docs] sorting of examples. if doesn’t work for you, update jekyll.
Merge pull request #909 from sergeyk/dev

[docs] sort examples
[docs] [fix] closes #899
[docs] ‘maximally accurate’ in the web demo explanation. closes #905
Merge pull request #910 from sergeyk/dev

web demo updates
[examples] fix links in feature extraction
Merge remote-tracking branch 'upstream/dev' into dev