Resolve import errors in Python3

The built-in interpreter in Sublime Text 3 raises 'ImportError'
exceptions if imports aren't relative to the 'Packages' directory.
The same issue doesn't occur in the standard Python3 interpreter.
Resolve the issue by hacking the path when running in Sublime Text.

Signed-off-by: Stephen Finucane <stephenfinucane@hotmail.com>

ctagsplugin.py

@@ -21,23 +21,21 @@
     import sublime
     import sublime_plugin
     from sublime import status_message, error_message
+
+    # hack the system path to prevent the following issue in ST3
+    #     ImportError: No module named 'ctags'
+    sys.path.append(os.path.dirname(os.path.realpath(__file__)))
 except ImportError:  # running tests
     from tests.sublime_fake import sublime
     from tests.sublime_fake import sublime_plugin
 
     sys.modules['sublime'] = sublime
     sys.modules['sublime_plugin'] = sublime_plugin
 
-if sys.version_info < (3, 0):
-    import ctags
-    from ctags import (FILENAME, parse_tag_lines, PATH_ORDER, SYMBOL,
-                       TagElements, TagFile)
-    from helpers.edit import Edit
-else:
-    from CTags import ctags
-    from CTags.ctags import (FILENAME, parse_tag_lines, PATH_ORDER, SYMBOL,
-                             TagElements, TagFile)
-    from CTags.helpers.edit import Edit
+import ctags
+from ctags import (FILENAME, parse_tag_lines, PATH_ORDER, SYMBOL,
+                   TagElements, TagFile)
+from helpers.edit import Edit
 
 #
 # Contants