Add boost-filesystem package for CI.

make distclean finally passes.

Bump to version 0.11.1

Up the version to 0.11.1.

Fix build on OSX.

Set the next 0.9 release to 0.9.2.

Bump to 0.9.0

Support gcc 5 cpp changes

Up the version to 0.9.1.

These test files are not in the repository.