v0.95rc
small modification to README
add GCC issue of MacOSX to README
Fixed typo.

ne -> num_edges
Merge branch 'dev/duerrp/typo/1' of https://github.com/duerrp/graphillion into duerrp-dev/duerrp/typo/1
Revert "v0.95rc"

This reverts commit e82c42f7791f1c0b8525a4930635f99779c7285b.