added size field to ModelData struct

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/develop@1196 c0027639-9190-0b57-01eb-f09a03790dae
Merge branch 'gdevelop' into gfeature-llvm

git-svn-id: https://roadrunnerlib.googlecode.com/svn/branches/feature-llvm@1197 c0027639-9190-0b57-01eb-f09a03790dae