Add test cases for #select_tag.
Cleanup whitespace.
Merge pull request #1353 from namusyaka/add-test-cases-for-select_tag

Add test cases for select tag
Fix compatibility with 1.8.7 .
Refactor.
Merge pull request #1354 from namusyaka/fix-compat-with-1.8.7

Fix compat with 1.8.7
Automatically add multipart option to form_for if include file_field
Fix a problem that Breadcrumb#del does not work when name type is String.
Fix a few typos.
Fix how to receive multipart option
Add test file for breadcrumbs.
Remove unused lines.
Merge pull request #1356 from namusyaka/fix-breadcrumbs

fix a problem that Breadcrumb#del does not work when name type is String, add tests
Merge pull request #1355 from tyabe/multipart_form

Automatically add multipart option to form_for if include file_field