[modules/battery] Better display for "unknown" charge status

Some laptops, such as Dells, may display an unknown charge state when
the battery is attached to a docking station, but discharging (because
of configuration settings for longevity of the battery).

Show that nicer.

bumblebee/modules/battery.py

@@ -109,7 +109,7 @@ class Module(bumblebee.engine.Module):
             if charge == "Discharging":
                 state.append("discharging-{}".format(min([10, 25, 50, 80, 100], key=lambda i: abs(i-capacity))))
             elif charge == "Unknown":
-                state.append("unknown")
+                state.append("unknown-{}".format(min([10, 25, 50, 80, 100], key=lambda i: abs(i-capacity))))
             else:
                 if capacity > 95:
                     state.append("charged")

themes/icons/ascii.json

@@ -49,7 +49,11 @@
 		"discharging-25": { "suffix": "dis" },
 		"discharging-50": { "suffix": "dis" },
 		"discharging-80": { "suffix": "dis" },
-		"discharging-100": { "suffix": "dis" }
+		"discharging-100": { "suffix": "dis" },
+		"unknown-25": { "suffix": "?" },
+		"unknown-50": { "suffix": "?" },
+		"unknown-80": { "suffix": "?" },
+		"unknown-100": { "suffix": "?" }
 	},
 	"caffeine": {
 		"activated": {"prefix": "caf-on" }, "deactivated": { "prefix": "caf-off " }

themes/icons/awesome-fonts.json

@@ -88,7 +88,12 @@
 		"discharging-80": { "prefix": "", "suffix": "" },
 		"discharging-100": { "prefix": "", "suffix": "" },
 		"unlimited": { "prefix": "", "suffix": "" },
-		"estimate": {	"prefix": ""  }
+		"estimate": {	"prefix": ""  },
+		"unknown-10": { "prefix": "", "suffix": "" },
+		"unknown-25": { "prefix": "", "suffix": "" },
+		"unknown-50": { "prefix": "", "suffix": "" },
+		"unknown-80": { "prefix": "", "suffix": "" },
+		"unknown-100": { "prefix": "", "suffix": "" }
 	},
 	"caffeine": {
 		"activated": {"prefix": " " },

themes/icons/ionicons.json

@@ -84,6 +84,11 @@
 		"discharging-50": { "prefix": "\uf115", "suffix": "\uf3e6" },
 		"discharging-80": { "prefix": "\uf114", "suffix": "\uf3e6" },
 		"discharging-100": { "prefix": "\uf113", "suffix": "\uf3e6" },
+		"unknown-10": { "prefix": "\uf112", "suffix": "\uf3bc" },
+		"unknown-25": { "prefix": "\uf115", "suffix": "\uf142" },
+		"unknown-50": { "prefix": "\uf115", "suffix": "\uf142" },
+		"unknown-80": { "prefix": "\uf114", "suffix": "\uf142" },
+		"unknown-100": { "prefix": "\uf113", "suffix": "\uf142" },
 		"unlimited": { "prefix": "\uf402", "suffix": "\uf493" },
 		"estimate": {	"prefix": "\uf402"  }
 	},