Add decompyle's 2.1 tests

Update README.rst to note new pythons supported since last update

test/decompyle/test_augmentedAssign.py

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+"""
+augmentedAssign.py -- source test pattern for augmented assigns
+
+This source is part of the decompyle test suite.
+
+decompyle is a Python byte-code decompiler
+See http://www.goebel-consult.de/decompyle/ for download and
+for further information
+"""
+
+raise "This program can't be run"
+
+a = 1
+b = 2
+a += b; print a  # a = a+b = 3
+a -= b; print a  # a = a-b = 1
+a *= b; print a  # a = a*b = 2
+a -= a; print a  # a = a-a = 0
+a += 7*3; print a  # == 21
+
+l= [1,2,3]
+l[1] *= 3;    print l[1]; # 6
+l[1][2][3] = 7
+l[1][2][3] *= 3;
+l[:] += [9];  print l
+l[:2] += [9];  print l
+l[1:] += [9];  print l
+l[1:4] += [9];  print l
+l += [42,43]; print l
+
+a.value = 1
+a.value += 1;
+a.b.val = 1
+a.b.val += 1;
+
+l = []
+for i in range(3):
+    lj = []
+    for j in range(3):
+        lk = []
+        for k in range(3):
+            lk.append(0)
+        lj.append(lk)
+    l.append(lj)
+
+i = j = k = 1
+def f():
+    global i
+    i += 1
+    return i
+
+l[i][j][k] = 1
+i = 1
+l[f()][j][k] += 1
+print i, l