add raise SystemExit
fix exit_code to 1
Merge pull request #49 from item4/cli/upgrade

CLI: fix bug at cliche upgrade
add EnvironmentContext to run command
use app_context
test history on travis
Merge pull request #48 from item4/cli/history

CLI: fix bug at setup.py - history
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
fix error in getting canonical name in PostgreSQL
non-instantiable class and non-changeable column