Add spec for Lazy.
add bsearch benchmark
add bsearch spec
refactor spec
add spec for option parameter
g add greater equal pattern
Separate not lazy function from lazy function.
Update README.md

Add a link to show user's page. 
Merge pull request #23 from byplayer/kwd

add optional parameter spec
Merge pull request #19 from Matsue/lazy

Add spec for Lazy.
add any spec
Merge pull request #18 from byplayer/bsearch

add bsearch benchmark