Configurable (templated) filenames for captures

[xurizaemon]

It'd be nice to have control of the filename from behat.yml configuration, and interpolate configured variables (or template string) with values from the step at hand.

In this way people could perhaps generate more informative screenshot naming, eg that included the feature filename, step line, time (accounting for repeated line entries from Examples: tables), success/fail state and other useful context.

I'm warming to the current layout, as it happens - but I think it'd be nice to be able to rearrange?

This would be a useful addition for things like #40 too.

Previously opened in error at drevops/behat-steps#70

[xurizaemon]

Oh hecksakes this is a duplicate of #37! Closing.