Harshavardhana 7ea1de8245 copyObject: Be case sensitive for windows only server. (#3766)
For case sensitive platforms we should honor case.

Fixes #3765

```
1) python s3cmd -c s3cfg_localminio put logo.png s3://testbucket/xyz/etc2/logo.PNG

2) python s3cmd -c s3cfg_localminio ls s3://testbucket/xyz/etc2/
2017-02-18 10:58     22059   s3://testbucket/xyz/etc2/logo.PNG

3) python s3cmd -c s3cfg_localminio cp s3://testbucket/xyz/etc2/logo.PNG s3://testbucket/xyz/etc2/logo.png
remote copy: 's3://testbucket/xyz/etc2/logo.PNG' -> 's3://testbucket/xyz/etc2/logo.png'

4) python s3cmd -c s3cfg_localminio ls s3://testbucket/xyz/etc2/
2017-02-18 10:58     22059   s3://testbucket/xyz/etc2/logo.PNG
2017-02-18 11:10     22059   s3://testbucket/xyz/etc2/logo.png
```
2017-02-18 13:41:59 -08:00
..
2017-01-12 10:19:59 -08:00
2016-10-26 08:46:14 -07:00
2017-02-10 11:51:41 -08:00
2017-02-18 13:41:33 -08:00
2017-02-15 18:05:55 -08:00
2017-02-15 17:45:11 -08:00
2017-02-15 17:45:11 -08:00