* Add a bunch of test for Parameter and DataHolder. Minibatch seed can be changed after cleaning or in defer_build.

* Add dataholder tests.

* Add failure creation tests to data holders.

* Shape and dtype for dataholders work for external tensors.

* According fix in dataholder test.

* Change travis file.

* Experiments with travis.

* Improvements in Parameterized tests.

* Exclude external optimizer from coverage report.

* Improvements in optimizer tests.

* Indent functions in optimizer's tests.

* Increase coverage in Parameterized.

* Increase codecov for Parameterized.

* Developing test coverage further.

* Tests Parameterized feeds.

* Call parameter size in tests.

* 100% for ParamList.

* Minibatch tests.

* Increase coverage for Minibatch.

* Setup.py clean up. Stick to 1.4 tensorflow version. Remove backwards for py2.7.

* Increase coverage for Parameters.

* Increase coverage for Parameters build check.

* Core tests for TensorConverter.

* Code coverage targets.

* Change initialization policy at decors and trainers.

* Check initialization status of variable using tf.is_variable_initialized tensor.

* [#568] Improve initialization status checking performance.

* [#568, #561] Test for Dataset iterators is not possible.

* Increase coverage for Parameter.  method was added, therefore required some tests.  method inconsistently handled session inputs.

* Added more tests for Parameter object covering cases when tensor is trainable and parameter is not. Also added test for Parameter string conversion.