[MCC-128760] Fix/transitions

Addresses an issue with transitions and meta links.  The transition initializer claimed that it required a hash with a single key with a hash value containing href.  This wasn't compatible with the current implementation of ```Transition#retrieve```, and was not how non meta link transitions were constructed.  PR also adds additional testing for meta links to the ```complex_representor_spec``` and updates the links shared example for the ```hale_serializer_spec```.  

Test results:
```
Finished in 0.38832 seconds
294 examples, 0 failures

Randomized with seed 13203
```