Revert "Bug 1068236 - Bump test agent to 0.25.0"

This reverts commit ade37b9bee544ef310f56907bddb8f4e8fef6973.
Revert "Revert "Bug 1068236 - Bump test agent to 0.25.0""

This reverts commit 9302b558fcfa7a8dcf797f5311bd719a33a799e8.

Reverting due to crossing commits in gaia upstream.
Update test-agent
marionette-js-runner 0.5.5
marionette-js-runner 0.5.6
vbump marionette-js-runner
Add yargs
yargs