Merge branch 'release/0.2.2'
Merge branch 'release/0.2.4'
Merge branch 'release/0.2.5'
Merge branch 'release/0.2.6'
Merge branch 'release/0.2.8'
Merge branch 'release/0.2.8-1'
Merge branch 'release/0.2.10'
Merge branch 'release/0.4.0'
Merge branch 'release/0.4.1'
Change user_credential method to POST.
Add plugin function.
Merge pull request #3 from Matsue/feature/plugin

Add plugin function.
Renamed from leo_tamer to leofs_console
Modify the configuration for the webrick
Add the copyright and format codes
Refactor - rename to leo-center
Rename the title
Roll leo-center version 0.4.2
Merge branch 'release/0.4.2'
Merge branch 'release/0.4.2' into develop