Use "reference" for type of resource column of Feeds
Use reference method
Add latest command
Bump version to 0.3.0

0.2.3 ->
0.3.0
  ^ ^
Fix a resource value for adding feed
Fix a variable name
Fix a group key
Rescue Groonga::InvalidArgument
Indent
Support for migration to 0.3.0 for existing database
Indent
Add a test for latest command
Add FIXME comment
Merge pull request #1 from myokoym/0.3.0

0.3.0