BUG: Interval(Timestamp(..., tz=...)) should show UTC offset

[mroeschke]

Pandas version checks

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Reproducible Example

In [17]: from pandas import *

In [20]: Interval(Timestamp('2013-01-01 16:00:00', tz="US/Eastern"), Timestamp('2013-01-02 08:00:00', tz="US/Eastern"))
Out[20]: Interval('2013-01-01 16:00:00', '2013-01-02 08:00:00', closed='right')

In [21]: Interval(Timestamp('2013-01-01 16:00:00', tz="US/Eastern"), Timestamp('2013-01-02 08:00:00', tz="US/Eastern")).left
Out[21]: Timestamp('2013-01-01 16:00:00-0500', tz='US/Eastern')

Issue Description

Though the left and right boundaries of the interval are tz aware, the repr of Interval does not indicate that the bounds are tz aware

Expected Behavior

Out[20]: Interval('2013-01-01 16:00:00-0500', '2013-01-02 08:00:00-0500', closed='right')

Installed Versions

Replace this line with the output of pd.show_versions()