eliminate unnecessary packages from ubuntu install command

The 3.3.0 documented command to install cordova-cli on Ubuntu incorrectly requires the user to explicitly list a large number of packages that are redundant and unnecessary since they are all dependencies of the single cordova-cli package that they do need to installed. 

This branch correctly reduces the install command to the single needed package.

https://issues.apache.org/jira/browse/CB-5700