the first update for the features of quantum annealing:
- created some files which feature are quantum simulated annealing and QUBO.

* added some files for travisCI
* updated quantpy/test.py to perform travisCI
* updated some files to perform test on travisCI
* merged openql-org/feature-hokusai
* updated test_sqa.py for 1 passed
* updated .travis.yml that deleted target of Python:3.7

mdrft's updates are:

* update repeat calc 
* update for repeat of trial and comments
* update qubo and sqa separated
* update cost function
* updated some comments
* bug fixed

kyamaz's updates are:

* added some files for travisCI
* updated quantpy/test.py to perform travisCI
* updated some files to perform test on travisCI
* merged openql-org/feature-hokusai
* updated test_sqa.py for 1 passed
* updated .travis.yml that deleted target of Python:3.7
* fixed indent issues in qubo.py

* added some files for travisCI
* updated quantpy/test.py to perform travisCI
* updated repeat calc
* updated for repeat of trial and comments
* updated qubo and sqa separated
* updated cost function
* updated some comments
* updated test_sqa.py for 1 passed
* updated .travis.yml that deleted target of Python:3.7
* fixed bugs
* fixed indent issues in qubo.py
* refactored to pass test_hadamard
* specified python version, removed <=3.4 for travis
* changed default backend for IBMQ
* refactored 
* fixed imports
* moved files concerned with ising calculation to ising folder

* added executor/simulator directory and placed some simulators.
* added new executor; classical_simulation_executor.py.

* IBMQExecutor is updated.
* On the condition, IBMQExecutor#sympy_to_qasm  would be replaced super class method.

moved the method; sympy_to_qasm -> BaseQuantumExecutor.to_qasm

added test files from sympy.physics.quantum of SymPy project.

* fixed as concerned with the former updates.
* updated AUTHORS file

* rename cpu_sim to numpy_simulator, fix bugs in numpy_simulator and classical_simulation_executor, and add tests_hadamard_numpy.py
* add comments

…#14)

* add the feature of the expression that can be reversed multiply order and with the test code.

* added some comments in each python files

…ure. (#16)

* added some comments and added assert in test codes on the "ising" feature.
* updated README.rst

- a few updates for packaging.
- change release version `0.0.2.dev1`

…and specs.

Squashed commit of the following:

commit e23d571a07d588700a3672024ce62d6bf53ff9e1
Author: OpenQL Project <committer@openql.org>
Date:   Sun Feb 18 20:53:06 2018 +0900

    updated __version__ in release.py

commit f235cfb649cfa4e5dccbf1a58838afd72cf74927
Author: OpenQL Project <committer@openql.org>
Date:   Sun Feb 18 20:52:04 2018 +0900

    updated ibmq_executor.py to fix some bugs and change parameters of __init__

commit d62e7c51dabf2fbe2bc76413f809f3ef7024270e
Author: OpenQL Project <committer@openql.org>
Date:   Sun Feb 18 20:47:37 2018 +0900

    updated classical_simulation_executor.py to change the return value of execute()

…tion

…tion

…ympy original

…ure operator.

- changed to_qasm function to be able to transform controlled-unitary operators.

…ure operator.

- changed to_qasm function to be able to transform controlled-unitary operators.
- updated quantpy/sympy/tests/sympy/physics/quantum/test_spin.py from sympy original

… operator

… operator.

…n from 0.0.2.dev5 to 0.0.2.dev7 (skipped dev6) #28

fix for issue#29

* pytest for setup.py
* pin qiskit version to 0.5.7

* fixed typo in setup.py
* suppress warning of test

    Qiskit upgrade (#33)

    * removed an unused dependency
    * updated qiskit to 0.7.0

* updated release version from 0.0.2.dev8 to 0.0.2.dev9

* fixed ibmq executor, added a test case

* clean up by flake8

* updated release version from 0.0.2.dev9 to 0.0.2.dev10

…d qiskit 0.8.0 updates. (#41)