add stable branch to .travis.yml
Adds spec
Fix customizable journal's value column
don't rely on journal record id to find predecessor and use version instead
dropped redundant limit
release 3.0.1
Merge pull request #1045 from machisuji/release/3.0.1

release/3.0.1
Merge pull request #1046 from opf/release/3.0

Release/3.0.1