Remove code duplication in error_messages_for.
Fix typos (a => an).
Fix a typo (part II).
Merge pull request #1394 from namusyaka/remove-code-duplication

Remove code duplication in error_messages_for.
Merge pull request #1393 from namusyaka/fix-typos

Fix typos (a => an).
Change content_type's default value for compatibility with Sinatra.
Change some test cases for #1350.
Merge pull request #1395 from namusyaka/change-content_type-value

Change content_type's default value for compatibility with Sinatra. Fixes #1350
Cleanup helper file of senseless comments
Remove several duplicated comments and fix typos
Remove unwanted multibyte char.
Fix doc for padrino-core
Alphabetical order for the require parts
Remove obsolete comments for the caller file
Merge pull request #1396 from namusyaka/remove-multibyte-char

Remove unwanted multibyte char. Fixes #1374
Fix typos and remove not meaningful comments in loader
Cleanup of comments from the logger class
Fix documentation for module file
Cleanup of documentation for the mounter file
Documentation cleanup for the reloader class