fix(continuous-deployment): assets not minified if src files copied before

The minification of the assets is never triggered because the `assets/install`
command is run before and lets the test for outdated files in the web folder
fail.

I've update the test to specifically check only for the minified files …
Merge pull request #19 from coderbyheart/continuous-deployment

fix(continuous-deployment): assets not minified if src files copied before