changed model.get_target_source and added initialization option in mlp
Run tests even if IRO is down
Fix syntax error
Small typo ".ipnb" -> ".ipynb"

Just a small typo in a README file.
Merge pull request #1270 from bartvm/download

Run tests even if IRO server is down
Merge pull request #1273 from MarCnu/tutorial-readme

Small typo ".ipnb" -> ".ipynb"
Merge pull request #1249 from JesseLivezey/targetsource

Added optional target_source to MLP
fix autoencoders

* extract AbstractAutoencoder for inheritance
** resolve Model methods before Block
** UntiedAutoencoder and DeepcomposedAutoencoder call their superclass constructor
* pep8
** extract YAML from test_autoencoder.py