added debug output to build script to find problem on TC
File: added AppendAllLines and ReadLines methods.
File: added missing encoding parameter in overloaded ReadLines method.
Access: added documentation files for the abstracted system access interfaces (copied from mscorlib.xml).
Merge pull request #12 from mmarkovic/master

Update: added File.AppendAllLines and File.ReadLines methods.
Access: created interface documentation for Directory.
Access: created interface documentation for DirectoryInfo.
Access: created interface documentation for DriveInfo.
Access: created interface documentation for Environment.
Access: created interface documentation for File.
Access: created interface documentation for FileInfo.
Access: created interface documentation for FileSystemInfo.
Access: created interface documentation for Path.
Merge pull request #13 from mmarkovic/AccessInterfaceDoc

IO: Access interface documentation