Add a Gemfile for development dependencies
Add a Rakefile for routine works
Add a VimFlavor for runtime dependencies
Configure Travis CI to use vim-flavor
Ignore intermediate files for utitlities
Farewell to mduem
Merge branch 'migrate-to-vim-flavor'
Normalize paths before comparison
Use a full path to infer the next/previous file

bufname('%') might return a path without a directory which contains the
file, especially if the file exists in the current directory.  But most
of altr rules require directory names to infer proper file.  Use a full
path for the inference engine to avoid unexpected results.
Merge branch 'bufname-issue'

Close gh-5.