Write datetime object

Older versions write datetime object as date object. This version fixes this problem. When a datetime object is written, it uses "DD/MM/YY HH:MM:SS" format.

Bug fix

numeric data with some user formated style in a xls file will lost

Use pyexcel-io 0.0.2

• IO interface update: pyexcel-io v0.0.2 introduced keywords

Release Update

• Removed xlsm, xlsx writer as xlwt does not handle it at all
• using pyexcel-io as unified plugin interface
• renamed the package: from pyexcel-xl to pyexcel-xls

Standalone wrapper library to read, write and manipulate data in xls, xlsx and xlsm formats

• a plugin to pyexcel
• a usable standalone library