changed simulated data
changes made for 1-step version
changes in normalisation/not normalisation of response functions
changes in vem
validation file for asl
Merge pull request #67 from ainafp/us-master-vem

Us master vem
#70: update doc for local PyHRF installation (manage env variable)
Merge pull request #71 from philouc/doc-instal-envar

close #70: update doc for local PyHRF installation (manage env variable)
Correct licence in README
Remove travis backup file and ignore them
Remove coding duplicate declaration
Add encoding to all lacking .py files