ax_python* : adding support for python 3.4

[consultit]

I'm a user of ax_python and ax_python_embed macros. 
I made (on debian jessie) 3.4 version my default (by adding a custom
alternative). 
Then I have had to patch the above macros just to work for my projects.
So it would be nice if support for version 3.4 (and 3.5) could be added
to the overall ax_python* macro family.

Thanks.

PS: I attached a patch got from "git diff" on latest source tree.

ax_python-autoconf-archive.patch
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