Version bump for 3.4.1rc1.
Added tag v3.4.1rc1 for changeset c67a19e11a71
Miscellaneous corrections and updates to the OS X README file.
support pep 3118 format strings for ctypes objects with nontrivial shapes (closes #10744)

Patch by Matti Picus.
Issue #21430: additions to the description of non-blocking SSL sockets
Upgrade pip to 1.5.6
Post-release version bump for 3.4.1rc1.  Sorry it's late!
Merge.