[xml] correcting invalid xml, adding namespace

- typo in the plugin.xml is fixed resulting in a 'more' valid xml
- adding Android namespace to make it a valid xml for parsing
  by other tools
[license] adding apache license file
[plugin.xml] standardizing license + meta
updated readme, name tag and namespace
[CB-4417] Move cordova-plugin-network-information to its own Java package.
CB-4595: updated version
Merge branch 'dev'