add failing tests

Request Type: test

How to reproduce: 

Component(s): ngResource

Impact: medium

Complexity: medium

This issue is related to: 

**Detailed Description:**

Hello, this is not a pull request for merging, but just in order to show a supposed bug with some test cases. Maybe i am just doing something wrong and this is not a bug.

Here i add three tests, two of them fail, the following ones:

    should send a verb on instance without parameter alias
    should send the DELETE verb on instance

In these cases the request is sent to the whole `/resource/` instead that to `/resource/123` as desired.

The most annoying is the one about the delete action. The `DELETE` request is sent to the whole resource endpoint. With some server side APIs, for example python Eve, this will empty the whole collection. I wasn't able to get clues from the source code about the reason of the problem. I think that i don't have to sign the agreement since this is not meant to be merged, right?

Cheers

**Other Comments:**

The two tests fail also on the `v1.2.16` branch
pretty sure resource instance methods don't return promises