cleanup tests to use pytest as described in flask docs

MANIFEST.in

 include README.md
+include setup.cfg
 include jass/swagger/swagger.yaml
 recursive-include jass/static *
 recursive-include celery_files *

inittable_test.py

-from jass.models.worktable import create_inittable_file
-input_data_path = '/home/hmenager/jass/jass/test/data_test1/*chr*.txt'
-init_covariance_path = '/home/hmenager/jass/jass/test/data_test1/COV.txt'
-regions_map_path = '/home/hmenager/jass/jass/test/data_test1/regions.txt'
-description_file_path = '/home/hmenager/jass/jass/test/data_test1/summary.csv'
-init_table_path = '/tmp/test.h5'
-create_inittable_file(input_data_path, init_covariance_path, regions_map_path, description_file_path, init_table_path)

setup.cfg

+[aliases]
+test=pytest

setup.py

@@ -27,6 +27,12 @@ setup(
     include_package_data=True,
     long_description="""\
     
-    """
+    """,
+    setup_requires=[
+        'pytest-runner',
+    ],
+    tests_require=[
+        'pytest',
+    ]
 )