Port network tests to plugin-test-framework

Ported test  from mobile-spec (which are written in jasmine 1.3) in
jasmine 2.0.
Added:
New js-module named tests to plugin.xml
Folder with tests working on jasmine 2.0
Merge branch 'CB-6964' of https://github.com/javierbb31/cordova-plugin-network-information into CB-6964
Fix naviagtor typo
CB-6964 ported manual tests

Fixed up style

Fixed typo in addEventListener
Renamed test dir and added nested plugin.xml
Merge branch 'CB-7166' of https://github.com/BBosman/cordova-plugin-network-information
Merge branch 'CB-6964' of https://github.com/stacic/cordova-plugin-network-information
remove reference to test assets, they are optional