Increase the mocha test timeout to avoid early timeouts.
Increase the mocha test timeout to avoid early timeouts.

An issue was picked up that on a development machine the tests would pass on all node version but not on Travis, This was due to the machine spec running the tests.
Development machines has alot better specs to run the tests than travis does and completed the tests quicker, thus avoiding the timeout

OHM-705

jembi/openhim-core-js,jembi/openhim-core-js