omf.packages.name: Fix regex by escaping a dot

Fix #901

pkg/omf/functions/packages/omf.packages.name.fish

 function omf.packages.name -a name_or_url
-  command basename $name_or_url | sed -E 's/^(omf-)?((plugin|pkg|theme)-)?//;s/.git$//'
+  command basename $name_or_url | sed -E 's/^(omf-)?((plugin|pkg|theme)-)?//;s/\\.git$//'
 end

pkg/omf/spec/omf_packages_spec.fish

+function describe_omf_packages_tests
+  function before_all
+    set -gx CI WORKAROUND
+  end
+
+  function it_can_extract_name_from_name
+    set -l output (omf.packages.name foo)
+    assert 0 = $status
+    assert "foo" = "$output"
+  end
+
+  function it_can_extract_name_of_a_plugin_package
+    set -l output (omf.packages.name plugin-foo)
+    assert 0 = $status
+    assert "foo" = "$output"
+  end
+
+  function it_can_extract_name_of_a_theme_package
+    set -l output (omf.packages.name theme-foo)
+    assert 0 = $status
+    assert "foo" = "$output"
+  end
+
+  function it_can_extract_name_from_name_ended_in_dot_git
+    set -l output (omf.packages.name foo.git)
+    assert 0 = $status
+    assert "foo" = "$output"
+  end
+
+  function it_can_extract_name_from_name_with_dot
+    set -l output (omf.packages.name foo.bar)
+    assert 0 = $status
+    assert "foo.bar" = "$output"
+  end
+
+  function it_can_extract_name_from_name_ended_in_git
+    set -l output (omf.packages.name foobargit)
+    assert 0 = $status
+    assert "foobargit" = "$output"
+  end
+
+  function it_can_extract_name_from_url
+    set -l output (omf.packages.name http://github.com/user/foo)
+    assert 0 = $status
+    assert "foo" = "$output"
+  end
+
+  function it_can_extract_name_from_url_of_a_plugin_package
+    set -l output (omf.packages.name http://github.com/user/plugin-foo)
+    assert 0 = $status
+    assert "foo" = "$output"
+  end
+
+  function it_can_extract_name_from_url_of_a_theme_package
+    set -l output (omf.packages.name http://github.com/user/theme-foo)
+    assert 0 = $status
+    assert "foo" = "$output"
+  end
+
+  function it_can_extract_name_from_url_ended_in_dot_git
+    set -l output (omf.packages.name http://github.com/user/foo.git)
+    assert 0 = $status
+    assert "foo" = "$output"
+  end
+
+  function it_can_extract_name_from_url_with_dot
+    set -l output (omf.packages.name http://github.com/user/foo.bar)
+    assert 0 = $status
+    assert "foo.bar" = "$output"
+  end
+
+  function it_can_extract_name_from_url_ended_in_git
+    set -l output (omf.packages.name http://github.com/user/foobargit)
+    assert 0 = $status
+    assert "foobargit" = "$output"
+  end
+end