Add change invoices ability

[TakteS]

Hello!

I just added functions for change invoices. My new tests are passes, but some old tests failed - I think it's because I changed setup block in the test file. Should I rewrite old VCR files to make it work?

[coveralls]

Coverage decreased (-0.8%) to 77.551% when pulling 0d94671 on TakteS:master into 1b6a71a on code-corps:master.

[coveralls]

Coverage decreased (-0.8%) to 77.551% when pulling a88ac47 on TakteS:master into 1b6a71a on code-corps:master.

[begedin]

@TakteS Unfortunately, our VCRs are quite flimsy and unstable, as I'm sure you've noticed. If you managed to get this working, we'll be happy to merge.

Otherwise, one of us will tackle it when we get the chance. However, I'm not sure when that will be.

While we're on it, I'd like to point you in the direction of our 2.0 branch. You might be able to get your feature working more easily there.

[lessless]

@begedin can it be due to different API versions?

[begedin]

@lessless Somehow, the VCR tapes have "sequential" dependencies, meaning they need to be re-recorded in exact order to work. It was before my time here, but I do have an idea how it may have happened. Unfortunately, that means that in order to fix them and avoid the same problem in the future, we need to rethink the general approach used and invest a moderate amount of time to do it.

[lessless]

@begedin I see. What would be an immediate solution? We do need this feature in our app :)

[coveralls]

Coverage increased (+1.4%) to 79.747% when pulling 6b7f215 on TakteS:master into 1b6a71a on code-corps:master.

[TakteS]

@begedin I rewrote some cassettes and now all tests are passed

[begedin]

@TakteS Excellent work. This is good to go, as far as I'm concerned. I just need you to squash the commits into a single commit and I can merge and release.

[lessless]

@begedin can you flip the switch then, please?

[begedin]

@lessless As I said, I need @TakteS To merge the 3 commits into one before I can merge. I do not have access to his fork, so @TakteS is the only one who can do this.

[coveralls]

Coverage increased (+0.2%) to 79.747% when pulling d89e865 on TakteS:master into 802694c on code-corps:master.

[coveralls]

Coverage increased (+0.2%) to 79.747% when pulling d89e865 on TakteS:master into 802694c on code-corps:master.

[TakteS]

@begedin Done