Fix installation and dependencies of odrivetool

Previously the install would fail if monotonic and appdirs were not
already installed before installing odrivetool.

tools/odrive/version.py

@@ -82,12 +82,12 @@ if __name__ == '__main__':
 
 def setup_udev_rules(logger):
   if platform.system() != 'Linux':
-      logger.error("This command only makes sense on Linux")
+      if logger: logger.error("This command only makes sense on Linux")
       return
   if os.getuid() != 0:
-      logger.warn("you should run this as root, otherwise it will probably not work")
+      if logger: logger.warn("you should run this as root, otherwise it will probably not work")
   with open('/etc/udev/rules.d/91-odrive.rules', 'w') as file:
       file.write('SUBSYSTEM=="usb", ATTR{idVendor}=="1209", ATTR{idProduct}=="0d3[0-9]", MODE="0666", ENV{ID_MM_DEVICE_IGNORE}="1"\n')
   subprocess.check_call(["udevadm", "control", "--reload-rules"])
   subprocess.check_call(["udevadm", "trigger"])
-  logger.info('udev rules configured successfully')
+  if logger: logger.info('udev rules configured successfully')

tools/setup.py

@@ -91,9 +91,8 @@ if creating_package:
 if not creating_package:
   import platform
   if platform.system() == 'Linux':
-    from fibre.utils import Logger
     try:
-      odrive.version.setup_udev_rules(Logger())
+      odrive.version.setup_udev_rules(None)
     except Exception:
       print("Warning: could not set up udev rules. Run `sudo odrivetool udev-setup` to try again.")
 
@@ -117,6 +116,7 @@ try:
       'IntelHex', # Used to by DFU to download firmware from github
       'matplotlib', # Required to run the liveplotter
       'monotonic', # For compatibility with older python versions
+      'appdirs',  # Used to find caching directory
       'pywin32 >= 222; platform_system == "Windows"' # Required for fancy terminal features on Windows
     ],
     package_data={'': ['version.txt']},