Merge pull request #150 from robotics-in-concert/indigo

Catch rocon uri errors in rapps, fixes #149.
rocon_app_manager: adds check for not installed apps (fixes #151)
Merge pull request #155 from robotics-in-concert/indigo

Find rapp resources in dependencies
Merge branch 'hydro-devel' of https://github.com/robotics-in-concert/rocon_app_platform into hydro-devel
rocon_app_manager: replace try with if
Merge pull request #152 from robotics-in-concert/invalid_installed_app

rocon_app_manager: adds check for not installed apps (fixes #151)
use simpler form of the rocon uri for rapps
Merge branch 'hydro-devel' of https://github.com/robotics-in-concert/rocon_app_platform into hydro-devel