update travis settings
update README
update version
extract mount_ponytail method
disabled button by config.active_record.migration_error
add notice to views
Merge branch 'release/v0.0.2'

* release/v0.0.2:
  add notice to views
  disabled button by config.active_record.migration_error
  extract mount_ponytail method
  update version
  update README
  update travis settings