List insert. Fixes issue #61.

Fix off-by-one in non-default values of index's 2nd and 3rd arguments.

Convert many object types structs to use C99 tagged initializer syntax.

Add Initial Support for STM32F4DISCOVERY Board

Make qstr_init reinitialize last_pool.

This causes the pool to get reinitialized properly on a soft-reset.

* Add a TARGET definition to Makefile (default PYBOARD).
* Add support for discovery LEDs in led module.
* Add support for discovery user switch in usersw
* Add EXTI interrupt handler for discovery user switch on (PA0).
* Parameterize led and usrsw modules pins and port.
* Issue #83

Move user switch code into a separate module

Implements str iterator

list.index fails on an edge case.

Implements list.index. Fixes issue #57.

* Move user switch code from main.c into a separate module (usrsw)
* Add usrsw.c to Makefile

Added DXF R2000 vector text.

Added SVG vector text.

Apple clang fixes

Now much more inline with how CPython does types.

OSX: fixes to make nlrx64.S with Apple's clang (switched to Apple-specific define instead of __llvm__)

Implements list.count. Fixes isue #55.

tests/bytecode/run-tests already uses puthon3.3, so let's just use it here
too.

Fore reference, errors with python 3.2.3:

  File "tests/generator1.py", line 12
    return None
SyntaxError: 'return' with argument inside generator

  File "tests/list_clear.py", line 3, in <module>
    x.clear()
AttributeError: 'list' object has no attribute 'clear'

etc.