Previously when retrieving apks only it's name would be used to choose
an apk. Now the native code reported by the apk is used to determine
the correct version to run for the specific device. It tries to
match the primary abi of device with native code before falling back to
using a compatible apk.
When using the check_abi parameter it no longer relies on naming convention
and only allows apks with native code supporting a devices primary abi to be
used.
Updated the relevant documentation.