init v3.1.5
add unicode_to_utf8tex to helpers (closes #29)
change None to ()
rename variables
test for help function unicode_to_utf8tex
test sphinx build on travis
test sphinx build on travis
update setup.py
test sphinx build on travis
test sphinx build on travis
update .gitignore
update README
change `vias.serial` to a more robust `merge`
update CHANGES.txt
fix redundant import
fix wrong test name
quiet errors
quiet errors
virtual interface to extra stuff for devs
close #34