partial changes for drawing serialization
support filter class with parse/write in code generator
fix mono/.net 2.0 compilation issue
fix xmlserialization issue because of changing the property gsLst
fix mono compilation issue
remove Linq using statement

to be compatible with .Net 2.0
XmlSerializationCodeGenerator enhancement

fix null issue in Write method; support different namespace in xml
attribute property like r:id
improve CT_Drawing serialization by using XmlDocument

get rid of XmlSerializer
fix notimplemented issue in CT_SheetPr
checkin latest .net 4 DLL
Merge branch 'master' of https://github.com/tonyqus/npoi
include test cases for XSSFConditionalFormatting
add two XSSF examples

chart is not working yet. This example is for experiemental purpose only