New package: py-fsspec (#12725)

* update py-bokeh: new version & dependencies

* Revert "update py-bokeh: new version & dependencies"

This reverts commit 5e191a0b20.

* new package: py-fsspec: add package.py

* trigger travis-ci

* adjust python dependency-type to br

var/spack/repos/builtin/packages/py-fsspec/package.py

@@ -0,0 +1,18 @@
+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyFsspec(PythonPackage):
+    """A specification for pythonic filesystems."""
+
+    homepage = "https://github.com/intake/filesystem_spec"
+    url = "https://github.com/intake/filesystem_spec/archive/0.4.4.tar.gz"
+
+    version('0.4.4', '27dfc3dab37d5c037683c7a3eaf7acd8b24ee56e4ce3edb14af54bdb43973d43')
+
+    depends_on('python@3.5:', type=('build', 'run'))
+    depends_on('py-setuptools', type='build')