Add gl command (that doesn't work)

    ✗ gitless.gl
    Traceback (most recent call last):
      File "/snap/gitless/x5/bin/gl", line 11, in <module>
        load_entry_point('gitless==0.8.6', 'console_scripts', 'gl')()
      File "/snap/gitless/x5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 480, in load_entry_point
        return get_distribution(dist).load_entry_point(group, name)
      File "/snap/gitless/x5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 2691, in load_entry_point
        return ep.load()
      File "/snap/gitless/x5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 2322, in load
        return self.resolve()
      File "/snap/gitless/x5/lib/python3.5/site-packages/pkg_resources/__init__.py", line 2328, in resolve
        module = __import__(self.module_name, fromlist=['__name__'], level=0)
      File "/snap/gitless/x5/lib/python3.5/site-packages/gitless/cli/gl.py", line 22, in <module>
        from gitless import core
      File "/snap/gitless/x5/lib/python3.5/site-packages/gitless/core.py", line 30, in <module>
        from sh import git, ErrorReturnCode
    ImportError: cannot import name 'git'

Author: techtonik

snap/snapcraft.yaml

@@ -1,3 +1,5 @@
+# obligatory fields
+
 name: gitless
 version: git
 summary: A simple version control system built on top of Git
@@ -7,8 +9,14 @@ description: |
   underlying concepts. Gitless is fully compatible with
   Git and can be used with it interchangeably.
 
-grade: devel
-confinement: devmode
+grade: devel          # 'stable' for stable/candidate upload
+confinement: devmode  # 'strict' after right plugs and slots
+
+# 'optional' fields
+
+apps:
+  gl:
+    command: bin/gl
 
 parts:
   libgit2: