Fix "trema --version" bug (fixes #248).
Fix iterate_list to be usable on empty list.
Upgrade gli (refs #248)
Add cucumber scenarios for trema --help option (refs #247).
Simplify test case.
Merge pull request #249 from y-higuchi/fix_iterate_list_on_empty_list

Fix iterate_list to be usable on empty list.
Refactor hello_trema.feature in order to delete stop_trema() and shutdown!() from .c and .rb (refs #247)
Merge branch 'develop' of https://github.com/trema/trema into develop
Refactor "I run" step not to use relative paths (refs #247)
Do not build hello_trema with Rantfile, since it is built in hello_trema.feature (refs #247)