define Title class and add relationships of it
Test on Title, and stylistic change
add migration script for titles
adjust frontend and test on it for multiple titles
remove old migration script
resolve conflicts
define LocaleType is used as Locale in SQLAlchemy
define orm classes for multiple titles, apply them
non-instantiable class and non-changeable column
work page is now accessed by canonical name
Merge pull request #38 from sjw0687/multiple_titles_for_work

Multiple titles for work
preserve discriminator
add Alembic script for #38
Fix situation where migrations not included in egg
Merge pull request #52 from tkiapril/migration-fix

Fix situation where migrations not included in egg
stylistic change on alembic script
Merge pull request #51 from sjw0687/alembic_script_38

Missing Alembic script for #38
migration scripts are completely fixed (close #50)
test on downgrade in migration script in travis ci
Merge pull request #55 from sjw0687/fix_issue_50

Fix all of database migration scripts and add test on downgrade in CI