added backend class
lems backend implementing backend
nrn backend implementing backend
fixed install method signature
Merge branch 'master' of github.com:borismarin/osb-model-validation into backend_class
tentatively setting env vars / path on install (subproc will inherit)
debugging env vars
debugging env vars
arch/path for nrn
fixing sloppy copy/paste
os.path.join doens't expect tuples...
stray / in path
more stray / in path
replacing OMT with OMV
Merge pull request #32 from borismarin/backend_class

refactored backends