Merge pull request #701 from guyer/Add_support_for_PETSc_solvers_REBASE

Add support for PETSc solvers [REBASE]

Fixes #387

Author: guyer

.appveyor.yml

@@ -80,7 +80,6 @@ install:
     - cmd: if "%TARGET_ARCH%" == "x86" if "%CONDA_PY%" == "27" conda.exe install --quiet --name root mayavi weave
     - cmd: if "%TARGET_ARCH%" == "x86" if "%FIPY_SOLVERS%" == "pysparse" conda.exe install --quiet --name root pysparse
 
-    - cmd: pip install future
     - cmd: pip install scikit-fmm
 
 # Skip .NET project specific build phase.