Update _Supercooled scipy interface

[vruge]

• provide jacobian for minimize algorithem
  • hidding scipy import ( I don't really like it)
  • because setup.py import _iapws -> import scipy before install_requires are checked

ref #48

[coveralls]

Coverage decreased (-0.06%) to 98.868% when pulling 6dc640777460beda74b97973a8fbff103bb493b1 on vruge:patch-1 into 939791c7900ac9fc0d6ca21b1094f33f5d6e64c9 on jjgomera:master.

[codecov-io]

Codecov Report

Merging #49 into master will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #49   +/-   ##
=======================================
  Coverage   98.92%   98.93%           
=======================================
  Files           8        8           
  Lines        4473     4486   +13     
=======================================
+ Hits         4425     4438   +13     
  Misses         48       48           

Impacted Files	Coverage Δ
iapws/_iapws.py	97.79% <100.00%> (+0.05%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 939791c...8e31092. Read the comment docs.

[jjgomera]

Thanks, applied!!

[jjgomera]

I don't like to hide import in a function, maybe I must relocate version number in setup.py or something similar.