use python3.5 for travis (#18)
use app_manager/example-min (#15)
update document (#14)
Fix travis (#16)
install launch directory (#9)
add run_depend of app_manager in README.md (#11)
update travis.yml (#10)
add empty applist0 directory c.f. https://stackoverflow.com/questions/115983/how-can-i-add-an-empty-directory-to-a-git-repository
calling self._load() and updating self._file_mtime are never happens, since self.update() is removed in https://github.com/PR2/app_manager/pull/7/files#diff-a8d7b30ba0e424e10aa794dec1928181L98
revert code from #7, which wrongly removed invalid_installed_files
Contributors: Kei Okada, Shingo Kitagawa, Takayuki Murooka, Yuki Furuta