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
change hash parameters
Merge pull request #2 from SmileZero/feature/fix_parameters

change hash parameters
delete Gemfile.lock
fix precompile css name
change application_helper to application_controller_extension
add alias_method for set_week