* Add data_type to hyperparameters (aws#54)

When we describe a training job the data type of the hyper parameters is
lost because we use a dict[str, str]. This adds a new field to
Hyperparameter so that we can convert the datatypes at runtime.

instead of validating with isinstance(), we cast the hp value to the type it
is meant to be. This enforces a "strongly typed" value. When we
deserialize from the API string responses it becomes easier to deal with
too.

* Add wrapper for LDA. (aws#56)

Update CHANGELOG and bump the version number.

* Add support for async fit() (aws#59)

when calling fit(wait=False) it will return immediately. The training
job will carry on even if the process exits. by using attach() the
estimator can be retrieved by providing the training job name.

_prepare_init_params_from_job_description() is now a classmethod instead
of being a static method. Each class is responsible to implement their
specific logic to convert a training job description into arguments that
can be passed to its own __init__()

* Fix Estimator role expansion (aws#68)

Instead of manually constructing the role ARN, use the IAM boto client
to do it. This properly expands service-roles and regular roles.

* Add FM and LDA to the documentation. (aws#66)

* Fix description of an argument of sagemaker.session.train (aws#69)

* Fix description of an argument of sagemaker.session.train

'input_config' should be an array which has channel objects.

* Add a link to the botocore docs

* Use 'list' instead of 'array' in the description

* Add ntm algorithm with doc, unit tests, integ tests (aws#73)

* JSON serializer: predictor.predict accepts dictionaries (aws#62)

Add support for serializing python dictionaries to json
Add prediction with dictionary in tf iris integ test

* Fixing timeouts for PCA async integration test. (aws#78)

Execute tf_cifar test without logs to eliminate delay to detect that job has finished.

* Fixes in LinearLearner and unit tests addition. (aws#77)

* Print out billable seconds after training completes (aws#30)

* Added: print out billable seconds after training completes

* Fixed: test_session.py to pass unit tests

* Fixed: removed offending tzlocal()

* Use sagemaker_timestamp when creating endpoint names in integration tests. (aws#81)

* Support TensorFlow-1.5.0 and MXNet-1.0.0  (aws#82)

* Update .gitignore to ignore pytest_cache.

* Support TensorFlow-1.5.0 and MXNet-1.0.0

* Update and refactor tests. Add tests for fw_utils.

* Fix typo.

* Update changelog for 1.1.0 (aws#85)

Scikit bring your own

Merging this in preparation for Monday's meeting.