Merge v0.12.3 into master 

## NB Upgrade notes
The normal [upgrade path](https://github.com/eve-seat/seat/blob/master/docs/UPGRADING.md) applies for v0.12.2 to v0.12.3.

### Fixes:
- Fix a issue introduced in v0.12.2 which could prevent searching from functioning correctly.
- Update `composer.json` to copy the sample `.env.php` file when installing dependencies.

#### Release Stats:
*4 commits* in *3 changed files* with *5 additions* and *4 deletions.*