[enh] "./ynh-dev test" to deploy, update and run unit test stuff (#24)
[enh] "./ynh-dev test" to deploy, update and run unit test stuff (#24)

* Adding ./ynh-dev test to deploy, update and run unit test stuff
* Fixing typo
* [fix] tests: use backcotes on python package check condition.
YunoHost/ynh-dev,zamentur/yunohost-development,YunoHost/ynh-dev