Fix "Then I should see message ..."

I was used as follows.
 -> Then I should see message "No matches for tag \"doSomething\""
Then message is "No matches for tag \\\"doSomething\\\""
We need to remove the backslash, like that "No matches for tag \"doSomething\""
Use s-replace instead of replace-regexp-in-string.
Add test for seeing quoted message.
Release v0.2.5.