[modules/title] Python < 3.4 compatibility

Replace textwrap.shorten() with custom implementation, since it is only
available since Python 3.4. While at it, catch i3 exceptions in order to
make unit tests (hopefully) run through.

Also, Updated README.md

see #174

README.md

@@ -5,7 +5,7 @@
 [![Test Coverage](https://codeclimate.com/github/tobi-wan-kenobi/bumblebee-status/badges/coverage.svg)](https://codeclimate.com/github/tobi-wan-kenobi/bumblebee-status/coverage)
 [![Issue Count](https://codeclimate.com/github/tobi-wan-kenobi/bumblebee-status/badges/issue_count.svg)](https://codeclimate.com/github/tobi-wan-kenobi/bumblebee-status)
 
-**Many, many thanks to all contributors! As of now, 21 of the modules are from various contributors (!), and only 16 from myself.**
+**Many, many thanks to all contributors! As of now, 22 of the modules are from various contributors (!), and only 16 from myself.**
 
 bumblebee-status is a modular, theme-able status line generator for the [i3 window manager](https://i3wm.org/).
 

bumblebee/modules/title.py

@@ -15,7 +15,6 @@ try:
 except ImportError:
     pass
 
-import textwrap
 import bumblebee.util
 import bumblebee.input
 import bumblebee.output
@@ -33,13 +32,13 @@ class Module(bumblebee.engine.Module):
         self._i3 = i3ipc.Connection()
         self._full_title = self._i3.get_tree().find_focused().name
 
-    def focused_title(self):
-        """Truncates and returns proper-length title."""
-        return textwrap.shorten(
-            self._full_title,
-            width=float(self.parameter("max", 64)),
-            placeholder=self.parameter("placeholder", "...")
-        )
+    def focused_title(self, widget):
+        title = self._full_title[0:self.parameter("max", 64)]
+        if title != self._full_title:
+            title = self._full_title[0:self.parameter("max", 64) - 3]
+            title = "{}...".format(title)
+
+        return title
 
     def update(self, widgets):
         """Update current title."""