Update Windows1250Encoding.ccp and Windows1252Encoding.ccp including Unit tests

* Add encoding names. According to the document below, the default encoding name should be "windows-1250" and "windows-1252".
   http://www.iana.org/assignments/character-sets/character-sets.xhtml
* Unit tests update to reflect the change.
Merge pull request #524 from siemens/fix_cp1250_cp1252

Update Windows1250Encoding.ccp and Windows1252Encoding.ccp including Uni...