Created alsabar (markdown)

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+Shows and controls alsa volume with a progressbar.
+
+Dependencies:
+
+- alsa-utils
+
+Plus tooltips, notifications, and color changes at mute/unmute switch.
+
+       myvolumebar = lain.widgets.alsabar()
+
+* Left click: Launch `alsamixer` in your `terminal`.
+* Right click: Mute/unmute.
+* Scroll wheel: Increase/decrase volume.
+
+The function takes a table as optional argument, which can contain:
+
+Variable | Meaning | Type | Default
+--- | --- | --- | ---
+`width` | Bar width | int | 63
+`height` | Bar height | int | 1
+`ticks` | Set bar ticks on | boolean | true
+`ticks_size` | Ticks size | int | 7
+`vertical` | Set the bar vertical | boolean | false
+`channel` | Mixer channel | string | "Master" 
+`step` | Step at which volume is increased/decreased | string | "5%"
+`colors` | Bar colors | table | see **colors**
+`notifications` | Notifications settings | table | see **notifications**
+
+### colors
+
+Variable | Meaning | Type | Default
+--- | --- | --- | ---
+`background` | Bar backgrund color | string | `beautiful.bg_normal`
+`mute` | Bar mute color | string | "#EB8F8F"
+`unmute` | Bar unmute color | string | "#A4CE8A"
+
+### notifications
+
+Variable | Meaning | Type | Default
+--- | --- | --- | ---
+`font` | Notifications font | string | The one defined in `beautiful.font`
+`font_size` | Notifications font size | string | "11"
+`bar_size` | Wibox height | int | 18
+
+It's **crucial** to set `notifications.bar_size` to your `mywibox[s]` height,
+**if** you have set it different than default (18). 
+
+`lain.widgets.alsabar` outputs the following table:
+
+Variable | Type
+--- | ---
+`widget` | `awful.widget.progressbar`
+`channel` | string
+`step` | string
+`notify` | function
+
+Finally, you can control the widget with the following key bindings:
+
+        -- Volume control
+        awful.key({ altkey }, "Up",
+        function ()
+            awful.util.spawn("amixer sset " .. volume.channel .. " " .. volume.step .. "+")
+            volume.notify()
+        end),
+        awful.key({ altkey }, "Down",
+        function ()
+            awful.util.spawn("amixer sset " .. volume.channel .. " " .. volume.step .. "-")
+            volume.notify()
+        end),
+        awful.key({ altkey }, "m",
+        function ()
+            awful.util.spawn("amixer set Master playback toggle")
+            volume.notify()
+        end),
+        awful.key({ altkey, "Control" }, "m", 
+        function ()
+            awful.util.spawn("amixer set Master playback 100%", false )
+            volume.notify()
+        end),
+
+where `altkey = "Mod1"`.
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