Make conversion of bitmap from OpenGL render context to WPF image more stable.
Add SetLastError to DllImport statements.
Merge pull request #49 from robinsedlaczek/Issue43-SetLastError

Add SetLastError to DllImport statements.
Added thanks to Robin on the readme page, added a changelog to keep careful track of changes in preparatio for a new release note.
Merge pull request #48 from robinsedlaczek/Issue44

Make conversion of bitmap from OpenGL render context to WPF image more s...
Merge branch 'master' of https://github.com/dwmkerr/sharpgl