grunt serve should serve compass images from tmp, not dist
grunt serve should serve compass images from tmp, not dist

fixes #189
narainsagar/generator-webapp-php,snatera15/generator-webapp-material,amercier/generator-webapp-php,narainsagar/generator-webapp-php,amercier/generator-webapp-php,narainsagar/generator-webapp-php,snatera15/generator-webapp-material,amercier/generator-webapp-php