Don't disable todochiku if todochiku-command is not a full path

Fixes #101
Change duplicate-line into duplicate-line-or-region

Closes #102
Merge branch 'master' of github.com:purcell/emacs.d
Load org features more lazily (or just implicitly)
Fix file extension regexes
Remove defunct autoload for inf-ruby
Introduce and use the after-load macro
Merge branch 'master' of github.com:purcell/emacs.d
Remove defunct autoload for doctest-mode
Add and use highlight-escape-sequences
Remove reference to git submodules in README
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