cleanup

- [SG] logging + config

- [CG] ensuring py2.5 compatibility for distribution
– i think there was only one place (mri_convert) where this is a problem and this has been addressed

- [SG] packaging (pypi)

- doc cleanup
– [SG] no doc for building pure python interface

- regression tests

- [SG] move to ipython 0.10.1 with checks for backward compatibility
- [SG] integrate xnat branch updates
– support for spm binary
– [CG] includes configurable deletion of working directory components
– [CG] should include configurable deletion of unneeded outputs

- cleanup mindflows
– move all examples from nipype.examples to mindflows
– ensure mindflows packaged under externals