Added pyfwfr to environment.yaml, added cython to buil meta.yaml.

[DominicParent]

Closes #42.

• Removed fwfr build code from conda-recipes/build.sh.
• Added cython in the build section of conda-recipes/meta.yaml.
• Added pyfwfr to environment.yaml file.

[DominicParent]

Oops, I forgot to run the unittest... I've just done that, and now I get what is the same error we were getting in the macOS build, if I remember correctly.

====================================================================== ERROR: tests.test_filtercol (unittest.loader._FailedTest)

ImportError: Failed to import test module: tests.test_filtercol Traceback (most recent call last): File "/home/user/miniconda3/envs/artemis-dev/lib/python3.7/unittest/loader.py", line 436, in _find_test_path module = self._get_module_from_name(name) File "/home/user/miniconda3/envs/artemis-dev/lib/python3.7/unittest/loader.py", line 377, in _get_module_from_name import(name) File "/home/user/Documents/Code/artemis/tests/test_filtercol.py", line 39, in module_exists("artemis.tools.filtercoltool", "FilterColTool"), File "/home/user/Documents/Code/artemis/tests/test_filtercol.py", line 31, in module_exists import(module_name, fromlist=[object_name]) File "/home/user/Documents/Code/artemis/artemis/tools/filtercoltool.py", line 19, in from artemis.tools._filtercoltool import Filter File "lib.pxd", line 75, in init artemis.tools._filtercoltool ValueError: pyarrow.lib.DictionaryMemo size changed, may indicate binary incompatibility. Expected 184 from C header, got 40 from PyObject

[DominicParent]

As per our discussions, I will consider this resolved for now. The filtercol tool will be dealt with at a later time.