Two step install process

Python packaging is moving towards wheels; don't try to install the
kernelspec as part of pip installation.

Switch to flit for packaging

bash_kernel/__init__.py

@@ -1 +1,3 @@
+"""A bash kernel for Jupyter"""
+
 __version__ = '0.3'

bash_kernel/install.py

@@ -0,0 +1,29 @@
+import json
+import os
+import sys
+
+from IPython.kernel.kernelspec import install_kernel_spec
+from IPython.utils.tempdir import TemporaryDirectory
+
+kernel_json = {"argv":[sys.executable,"-m","bash_kernel", "-f", "{connection_file}"],
+ "display_name":"Bash",
+ "language":"bash",
+ "codemirror_mode":"shell",
+ "env":{"PS1": "$"}
+}
+
+def install_my_kernel_spec(user=True):
+    with TemporaryDirectory() as td:
+        os.chmod(td, 0o755) # Starts off as 700, not user readable
+        with open(os.path.join(td, 'kernel.json'), 'w') as f:
+            json.dump(kernel_json, f, sort_keys=True)
+        # TODO: Copy resources once they're specified
+
+        print('Installing IPython kernel spec')
+        install_kernel_spec(td, 'bash', user=user, replace=True)
+
+def main(argv=None):
+    install_my_kernel_spec()
+
+if __name__ == '__main__':
+    main()