Define MaidsafeGeneratedSourcesDir and install headers from it.
fix for boost libs in unix
Merge pull request #147 from smspillaz/maidsafe/next/nfs/4

Define MaidsafeGeneratedSourcesDir and install headers from it.
Merge pull request #149 from dirvine/MAID-256-fix-boost-header-location-in-de

fix for boost libs in unix