…es" arg is meaningless

…isn't found in the apple docs)

When running from ProcessNSO in document-generated-code instead of the one in AppleDocMerger, the context hasn't been created yet. This creates it to avoid a null reference exception.

If a specific number of types are missing AppleDocMerger throws. This was hard-coded before and now this is configurable via the command-line which is useful when building against different documentation sets.

…and-line

…ommand-line

Additionally, this patch sets the default archive for MonoMac and MonoTouch eliminating the need to compile in docfixer.mm.cs or docvixer.mt.cs. The invoker is also notified if the doc bundle does not exist.

…ocation command-line configurable

This removes references to MonoTouch and makes the namespace configurable from the command-line. Additionally, the Apple docs location can also be specified when a merge should be performed. This eliminates the "appledocs" parameter in favor of "apple-doc-dir" for consistency with docfixer.