change adapter for travis from mysql2 to sqlite3
Fixed popular stocks query

* By pull request #68, updated_at is added to 'group by'.
  This might cause wrong result on popular_stocks.each,
  so I've fixed group method arguments from a string to
  multiple string arguments.
fix rspec settings
add expectation for link click trainsition
Merge pull request #75 from lodge/stabilize_travis

多分だいぶ安定したはず
Configured multiple database testing on Travis CI
マージミスの修正
Merge remote-tracking branch 'origin/develop' into bootstrap
Added rake db:create
Fixed popular articles query
Modified to use same .first style
Merge pull request #76 from lodge/travis_ruby_db_matrix_testing

Travis ruby db matrix testing
Merge remote-tracking branch 'origin/develop' into bootstrap
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