from_dict / to_dict should accept same orient parameter
Hello,

`pd.DataFrame.to_dict` accepts `orient` parameter in
`['dict', 'list', 'series', 'split', 'records', 'index']` (default being `'dict'`)

http://pandas.pydata.org/pandas-docs/version/0.17.1/generated/pandas.DataFrame.to_dict.html

`from_dict` only accepts `orient` parameter in `['columns', 'index']` (default being `'columns'`)
I think that `from_dict` should accept same parameter `orient` for API consistency

http://pandas.pydata.org/pandas-docs/version/0.17.1/generated/pandas.DataFrame.from_dict.html

Same for `Panel`
http://pandas.pydata.org/pandas-docs/version/0.17.1/generated/pandas.Panel.from_dict.html
`to_dict`: missing method for Panel

Same for `Series`
http://pandas.pydata.org/pandas-docs/version/0.17.0/generated/pandas.Series.to_dict.html
`from_dict`: missing method for Series

Kind regards
