Convert version to float for version compare

This pull request fixes a test error I'm seeing in job_test.rb, specifically, "should be toucheable" in the "for #kick" context. Here's the output from rake for the failed test
```
Beaneater::Job::for #kick#test_0001_should be toucheable:
ArgumentError: comparison of String with Float failed
    /src/beaneater/test/job_test.rb:142:in `>'
    /src/beaneater/test/job_test.rb:142:in `block (3 levels) in <top (required)>'
```