Suggestion: use @step instead of more specific decorators

[mbt-eric-b]

Step definitions in expectations.py are using the decorator @then
This makes it mandatory to use the keyword Then in the scenario for these steps.
Why not simply use @step instead of @then, so that the scenario can be written with any of the keywords?

For instance:
@step('I wait on element "([^"]*)?"(?: for (\d+)ms)*(?: to( not)* (be checked|be enabled|be selected|be visible|contain a text|contain a value|exist))*')
makes it possible to write
When I wait on element "myButton" to be enabled
but also
And I wait on element "myButton" to exist
or
Then I wait on element "myButton" to exist

while the current implementation only allows the last syntax.

[spyoungtech]

Sounds reasonable to me. I'd be happy to accept a PR to this effect.

IIRC, the steps are setup to match the webdriverIO steps but I don't think there is a problem expanding this, as far as I can tell.

[mbt-eric-b]

Here you go: #99
Thanks.