Update readme and lib and start 2015.

2015/d1.py

@@ -0,0 +1,22 @@
+from lib import *
+
+data = open(0).read()
+
+part_2 = True
+
+floor = 0
+for i, c in enumerate(data):
+    if c == "(":
+        floor += 1
+    elif c == ")":
+        floor -= 1
+    else:
+        print(c)
+        assert False
+
+    if part_2 and floor == -1:
+        print(i + 1)
+        break
+
+if not part_2:
+    print(floor)