BUG: resample by BusinessHour raises ValueError
- [x] closes #12351 
- [x] tests added / passed (`TestPeriodIndex.test_resample_hourly_business_hourly`)
- [x] passes `git diff upstream/master | flake8 --diff`
- [x] whatsnew entry

I did this during pandas sprint at PyCon 2016. Hope this close #12351
Resampling with BusinessHour took much more consideration I guess.
Please review this. Any comments are welcome.

## [Current coverage](https://codecov.io/gh/pydata/pandas/pull/13364?src=pr) is **84.23%**

> Merging [#13364](https://codecov.io/gh/pydata/pandas/pull/13364?src=pr) into [master](https://codecov.io/gh/pydata/pandas/branch/master?src=pr) will increase coverage by **<.01%**

``` diff
@@             master     #13364   diff @@
==========================================
  Files           138        138          
  Lines         50724      50727     +3   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits          42726      42729     +3   
  Misses         7998       7998          
  Partials          0          0          
```

> Powered by [Codecov](https://codecov.io?src=pr). Last updated by [103f7d3...2d3be12](https://codecov.io/gh/pydata/pandas/compare/103f7d31e1b850e532ed85a4b53ef222d1271c54...2d3be12277a1a99fdf7cb9fc5b2b8a9fee13f851)
 can you update
 @scari Do you have time to rebase and update this?
 can you rebase / update?
 can you rebase and move release notes to 0.19.2
 can you rebase / move whatsnew to 0.20.0 closing as stale