fix bindings to DSpace 4.2 API where necessary
update installation README and produce first (probably not working) binary release
remove redundant config files and synchronise changes with existing config files to dspace 4.2
updates to scripts and config files to support initial installation of the duo extensions to a pre-built dspace 4.2
tweaks to documentation and install scripts following first successful install of updated DSpace with Duo plugins
add binary release for 2.0
remove erroneously added binary build directory
add v2 build directory to gitignore
add documentation for upgrade from 1.8 to 4.2