Feature/gpu validation issue #68 (#84)

Fixes #68
Corresponding feature: #67

* Reproduce the hh-soma validation test on GPU.
* Reproduce the ball and stick model on GPU.
* Reproduce miniapp spike chains.
* Add `cell_group` unit test to the cuda unit tests: builds simple ball and stick model and integrates for 50ms and records how many spikes occur; it is a simple early warning that something is broken, but is no substitute for the validation tests.
* Update the `validate_soma`, `validate_ball_and_stick` and `validate_synapses` validation tests for the GPU backend:
    * refactor individual tests into test runner functions that are templated on lowered cell type;
    * for each of the original validation tests add a cuda (.cu) implementation, and write an additional "backend" field to the validation trace metadata.
* Use a `CPrinter` to generate the same `net_receive` block that is used for the multicore backend.
  Note: this is not efficient, because each read/write requires a cuda memcpy betwe...