Added "+" to list of liberty token characters
renamed LibertyParer to LibertyParser
Added hierarchy -libdir option
Include unistd.h in passes/hierarchy/hierarchy.cc (required for access(3))

This fixes compilation errors on Arch Linux.

Signed-off-by: Martin Schmölzer <martin.schmoelzer@student.tuwien.ac.at>
Merge pull request #20 from mschmoelzer/master

Include unistd.h in passes/hierarchy/hierarchy.cc (required for access(3))
Merge pull request #2 from cliffordwolf/master

hierarchy
Merge branch 'master' of https://github.com/ahmedirfan1983/yosys into btor
width issues
dff cell for more than one registers