Added test file for rt85919.
Change environment variables for extended tests.

'Lancaster' specifies this should be 'EXTENDED_TESTING'.
See https://github.com/Perl-Toolchain-Gang/toolchain-site/blob/master/lancaster-consensus.md

Thanks to Leon Timmermans for the suggestion!
Merge pull request #15 from mbeijen/fetch-lost-connection

Added test file for rt85919.
Merge pull request #14 from mbeijen/lancaster

Change environment variables for extended tests.