BUG: SparseSeries constructor ignores input data name

[sinhrks]

When constructing Series from Series, name attribute is preserved otherwise specified.

import pandas as pd
s = pd.Series([1, 2, 3], name='a')
pd.Series(s)
#0    1
#1    2
#2    3
# Name: a, dtype: int64

pd.Series(s, name='x')
#0    1
#1    2
#2    3
# Name: x, dtype: int64

But SparseSeries doesn't preserve its name.

s = pd.SparseSeries([1, 2, 3], name='a')
pd.SparseSeries(s)
#0    1
#1    2
#2    3
# dtype: int64
# BlockIndex
# Block locations: array([0], dtype=int32)
# Block lengths: array([3], dtype=int32)

[jreback]

lgtm, merge when green.

[sinhrks]

Thanks for review.