should preserve timestamp
Merge pull request #42 from shrkw/converter_should_preserve_timestamp

Preserve timestamp tool/convert.rb

Pull requested by @shrkw. Thanks!!!
Create README.md
added test-case
fix test case
fix error when provide unknown params
Merge pull request #43 from hiki/fix-direct-access-and-multiple-params

Fix direct access and multiple params
upgrade dependency
Merge branch 'master' into rubima
avoid invalid byte sequence error
Merge pull request #44 from murashin/master

avoid invalid byte sequence error
add support for data generated by misc/plugin/attach.rb
use FileUtils instead of system method
add support for misc/plugin/attach.rb with encoded filename
Merge pull request #45 from murashin/master

add support for data generated by misc/plugin/attach.rb
Remove trailing white spaces
Extract convert_attachments

But I don't test this commit, yet.
I don't have enough environment for test.
Use meaningful names
Use extracted local variable
add missing arguments