First minor update to arrayfire-python v3.2

• Bug fixes:
  • get_version() now returns ints instead of c_int
  • Fixed bug in tests/simple/device.py
• The module now looks at additional paths when loading ArrayFire libraries.
  • Link to the wiki is provided when ctypes.cdll.LoadLibrary fails.
• New function:
  • info_str() returns information similar to info() as a string.
• Updated README.md with latest instructions