py: Add some qstrs to the global table.
ffi: Fix mp_obj_str_get_data() return type.
unix microsocket: Add dummy makefile() method.

Unlike CPython socket, microsocket object already implements stream protocol
(read/write methods), so makefile() just returns object itself. TODO: this
doesn't take care of arguments CPython's makefile() may accept.
Refactor list comparison code to mp_seq_cmp_objs().
Implement tuple comparison.
Implement tuple addition.
Implement tuple multiplication.
unix: Implement time.sleep().
Add NotImplementedError.
Clean up handling of function return type annotation.
Factor out mp_seq_index_obj() function to implement .index() on sequences.
Implement tuple.index().
Factor out mp_seq_count_obj() and implement tuple.count().
socket: Make sure that symbol definitions are const.
socket: Tighten up int-to-str conversion.
Get rid of calloc().

If there's malloc and memset, then there's no need for calloc, especially if
we need to implement it ourselves.
Updated teensy to work with latest on master

Added analogRead, analogWriteXxx and servo support for teensy.
Merge branch 'master' of github.com:micropython/micropython
Fix some int casting that failed on 64 bit architecture.
Merge pull request #267 from pfalcon/func-ret-ann

Clean up handling of function return type annotation.