create functional module
fix gemspec
create initialize hooks
add require in date_paginate.rb
fix some bug and add css
change to css
correct default css
compelete summary and description
change css name
vendor/bundle
change to rspec, add days function and fix weeks view
delete useless parameters in Paginator
delete .keey
Merge pull request #1 from SmileZero/feature/create_within_period_module

Create functional part first