Added weapons, weapon proficiencies, and equipment.

tests/test_weapon.py

@@ -0,0 +1,12 @@
+import unittest
+
+from dungeonsheets.weapons import Weapon
+
+class WeaponTestCase(unittest.TestCase):
+    def test_weapon_damage(self):
+        weapon = Weapon()
+        weapon.base_damage = '1d6'
+        self.assertEqual(weapon.damage, '1d6')
+        # Now add some bonus damage
+        weapon.bonus_damage = 2
+        self.assertEqual(weapon.damage, '1d6 +2')