Fix links in Documentation.
Add required package libpcap0.8-dev
Merge pull request #295 from anadahz/set_deps-fix

Add required package libpcap0.8-dev
Merge pull request #294 from anadahz/ooni-documentation_fix

Fix links in Documentation.
Skip tests that require an internet connection if such is not available
Merge branch 'master' of github.com:TheTorProject/ooni-probe

* 'master' of github.com:TheTorProject/ooni-probe:
  Add required package libpcap0.8-dev
  Fix links in Documentation.
Merge branch 'master' into feature/tor_version

* master:
  Skip tests that require an internet connection if such is not available
  Add required package libpcap0.8-dev
  Fix links in Documentation.
Provide a useful error message if we fail to load the inputfile