CB-5595 Add docs for IAB's toolbarposition option
CB-5594 Added docs for IAB's disallowoverscroll option
CB-5489: add missing docs for Android-specific config
[CB-5666] Add Ubuntu platform guide.
[CB-5666] Add Ubuntu platform guide for edge version.
Update .gitignore and README.md to not require sudo for dependencies.
CB-5232 Add note about cordova as lib
CB-5232 Add note about android subproject to upgrade guide as well
CB-5658 Delete plugin API reference in favour of links to github doc/index.md files
CB-5648: Clarify parms to "cordova create"

Especially for the optional parameters.
And mention the default values