fixed code problem

- DATA_KEY_NAME not defined
- missing return statement
added test-cases
Close #6
Use Coveralls
Close #7 Close #8
fix notice "Undefined offset: 2"
add support Bing Optimized IE
Close #9
Update submodule
Fix to set empty LC_ALL
Add YDN smartphone crawler
woothee/woothee-ruby#2
Bump
Add HHVM for .travis.yml
Update PHPUnit
Reduce sub-directory level
Merge pull request #10 from woothee/prepare-v0.4.2

v0.4.2