Change Item __repr__ to Subject/From

[campb303]

Currently an item's representation when printed is just its queue name and number smashed together like ce1 or aae32. It would be more helpful to have the subject and from data available as well e.g.

from webqueue2api import Item
ce_1 = Item("ce", 1)
print(ce_1)

[ce1] From: campb303, Subject: Printer Issues

[campb303]

This has been fixed:

from webqueue2api import Item

item = Item("ce", 22)

# Old __repr__ output:
>>> print(item)
"ce22"

# New __repr__ output:
>>> print(item)
"[ce22] (awhelton) Laptop Battery Replacement"