spec_helper boilerplate
Promote #get_filename to Runner (mimic #get_env)
Promote environments to a (lazy-load) method
#attr_accessor works inside modules too

It just defines methods.
Let runners get the source env by themselves

And use accessors.
Enter mysql::Loader
Invert class/module roles among runners
Enter the load task (and relative runner)
I ❤ symbols
I ❤ sequential execution

AKA: a contrived commit!
Using the Rails constant, should depend on the gem
Ignore `which` output
Extract an input getter
Remove spurious output
Fix runners specs
We're not nuff lazy