[2.3] Add missing development dependencies

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT

I've also added a run of the test suite in every component scope.
you can simplify this:

```
env:
    global:
        - components=no

matrix:
    include:
        - php: 5.5
          env: components=yes
```

this avoids excluding the ``components=yes`` from the build