adding script to generate tensor type table

doc/generate_dtype_tensor_table.py

+
+letters = [
+    ('b', 'int8'),
+    ('w', 'int16'),
+    ('i', 'int32'),
+    ('l', 'int64'),
+    ('d', 'float64'),
+    ('f', 'float32'),
+    ('c', 'complex64'),
+    ('z', 'complex128') ]
+
+shapes = [
+        ('scalar', ()),
+        ('vector', (False,)),
+        ('row', (True, False)),
+        ('col', (False, True)),
+        ('matrix', (False,False)),
+        ('tensor3', (False,False,False)),
+        ('tensor4', (False,False,False,False)),]
+
+hdr = '============ =========== ==== =========== ================================='
+print hdr
+print 'Constructor  dtype       ndim shape       broadcastable'
+print hdr
+for letter in letters:
+    for shape in shapes:
+        suff = ',)' if len(shape[1])==1 else ')'
+        s = '(' + ','.join('1' if b else '?' for b in shape[1]) + suff
+        print '%s%-10s  %-10s  %-4s %-10s  %-20s' %(
+                letter[0], shape[0], letter[1], len(shape[1]), s, shape[1]
+                )
+print hdr