Added piesno
Added tests
cleaned init
Changed tests + small fixes
Changed tests to work with optimal quantile value instead of median
Merge branch 'nipy-dipy-master' into piesno
Added piesno
Added tests
cleaned init
Changed tests + small fixes
Changed tests to work with optimal quantile value instead of median
Merge branch 'piesno' of github.com:samuelstjean/dipy into piesno
Added pep 8 + ref + numerical stability
fixed test not returning mask
Update noise_estimate.py
Added more precision for test
Re-added float32 conversion
Update noise_estimate.py
Merge pull request #337 from samuelstjean/piesno

Piesno
RF: don't use -fopenmp flag if it doesn't work

Fairly general refactor of setup to try candidate compile flags, and
remove flags from compile that cause a compile or link error.

MinRK's pyzmq zeromq build machinery was the main inspiration for this
way of doing it.