feat(octopress): add tags list generator
style(merc): move 'then' on the line of the 'if'
fix(tmux,grunt): use backward-compatible grunt command

Use 'grunt server' which is the legacy command instead on 'grunt serve',
unsupported by old configuration.
feat(tmux): add octopress shortcut
style(indent)
refactor(tmux): enable 'vi' mode
style(indent)
feat(tmux): add 'r' binding to respawn pane

This allow to reload pane with last command
docs(tmux): describe app concerned by source file
chore(tmux): remove commented lines
feat(tmux): change username color when non-default