Change file structure of the program.

Deleted <paper> controller.
Created <search> controller.
Completed a simple english word segmentation.
Clean up testing file of <paper> controller.
Refactoring: refer <Ruby Style Guide>
Created <submit> controller.
Joined Bootstrap frame.
Using Bootstrap beautify index.html
Created UtilModule.
Created Bing.com search module.
Code refactoring for utility module.
Complete submit function.
Updated index.html
Updated UtilityModule.

1. Added string_similarity_factor func.
2. Added has_article_title? func.
3. Added title_from_h_tag func.
4. Added article_title_from_url func.
Added origins.html.erb and translates.html.erb for <SearchController>.
Add to ignore rules on database.yml file.
Delete search.html.erb file.
Update application.html.erb.

Add javascript_include_tag & stylesheet_link_tag
Update index.html
临时更新
新增title_from_url(url)函数。
完成search_controller实现。

完成了search函数。
新增了两个函数，origin_by_origin(origin)和origins_by_url(url)