WIP framework can now report its version

Find the motivation and details in the companion calabash-ios gem pull request.

https://github.com/calabash/calabash-ios/pull/350

Briefly, this PR provides several ways to find the calabash.framework:

#### Visual

```
$ tree -L 2 calabash.framework/
calabash.framework/
├── Headers -> Versions/Current/Headers
├── Resources -> Versions/Current/Resources
├── Versions
│   ├── 0.9.169 -> A
│   ├── A
│   └── Current -> A
└── calabash -> Versions/Current/calabash
```

#### command line

```
$ calabash.framework/Resources/version => 0.9.169
```

#### extracted from the compiled binary

```
$ strings Briar-cal.app/Briar-cal | grep -E 'CALABASH VERSION' => CALABASH VERSION: 0.9.169
```