Added saveAll, remove and removeAll#2

Open

maksymilian-majer wants to merge 3 commits intoprotonet:masterfrom

maksymilian-majer:remove_method

Commits on Dec 30, 2015

Added saveAll, remove and removeAll methods to the plugin and documented them in the README file.
maksymilian-majer
committed
Removed unnecessary value from options.
maksymilian-majer
committed

Commits on Nov 24, 2017

Added package.json so it works with newer cordova
Maksymilian Majer
committed