[setup] honour NIX_[INC|LIB]DIR again

Needed when using non-installed NIX
[PySimpleTag] remove none_t position setter
PyDataArray: fix typo; it is range not reange
[core] add transmogrify for vector<int>

Needed for file.version
[test] fixup SimpleTag positions change
[test] fix for version change from str to tuple
[travis] Add boost-[system, file-system, po] deps

po == program-options
Merge pull request #59 from gicmo/compile_again

Make it compile and tests run again

Very nice