[ENSCORESW-2612]. Send notification only when build status changes, on_success defaults to 'change' accoring to documentation.

Broaden the net to see whether it is only perl 5.26 on the travis docker image which is failing gene.t

[ENSCORESW-2343]. Bug as we want the total number of seconds represented by the timedelta structure. Use more powerful token, encrypt it and use as global variable in the triggering script.

- Shortcut to only checkout the bioperl release we want and not pull the whole git tree

- Modified harness to use $ENSDIR as the root dir if available

remove alias recipient as it is not a recognised github account

test 5.12 and 5.14 for future compatibility checks