init rust db backend

lootalot_db/migrations/2019-06-10-123922_create_items/down.sql

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+DROP TABLE items;
+

lootalot_db/migrations/2019-06-10-123922_create_items/up.sql

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+CREATE TABLE items (
+  id INTEGER PRIMARY KEY,
+  name VARCHAR NOT NULL,
+  base_price INTEGER NOT NULL
+);

lootalot_db/migrations/2019-06-10-123940_create_players/down.sql

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+DROP TABLE players;

lootalot_db/migrations/2019-06-10-123940_create_players/up.sql

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+CREATE TABLE players (
+  id INTEGER PRIMARY KEY,
+  name VARCHAR NOT NULL,
+  debt INTEGER DEFAULT 0, -- debt to the group in copper pieces
+  cp INTEGER DEFAULT 0,
+  sp INTEGER DEFAULT 0,
+  gp INTEGER DEFAULT 0,
+  pp INTEGER DEFAULT 0
+);

lootalot_db/migrations/2019-06-10-124013_create_looted/down.sql

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+DROP TABLE looted;

lootalot_db/migrations/2019-06-10-124013_create_looted/up.sql

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+CREATE TABLE looted (
+  id INTEGER PRIMARY KEY,
+  player_id INTEGER NOT NULL,
+  item_id INTEGER NOT NULL,
+  acquired_date DATE DEFAULT NOW,
+  FOREIGN KEY (player_id) REFERENCES players(id),
+  FOREIGN KEY (item_id) REFERENCES items(id)
+);