Use sequel database engine.
remove debug print
fix typo.
Fix sequel connection issue.
Fix database type handling.
Add TODO commnet
Merge pull request #17 from koichiro/support-sequel

Use sequel database engine.
add pry, and pry-nav for development
add rake console task
fix dotenv is not loaded at the toplevel scope
remove subtract
remove N+1 query
remove sulimit, sllimit, stype
remove gmode
Update README.md
Merge pull request #19 from sonots/remove-subtract

Remove subtract
travis
Merge pull request #21 from sonots/travis

travis
add .ruby-version to .gitignore
Revert "travis"

This reverts commit 32c8e0776445045abda64ca7c271d2831f2ec067.

Oops, gem install librrd fails on travis ....