Update README
add configuration for eim, w3m & realgud
tweak keybindings for etags and history commands.
improve org-archive-subtree-to-file
move org-mode & markdown-mode configuration to new file

--HG--
rename : misc/markdown-mode.el => text/markdown-mode.el
rename : misc/org-cua-dwim.el => text/org-cua-dwim.el
add package & configurations for asciidoc
remove qtmstr-outline.el (moved to dotemacs-extra)
replace doc-mode with adoc-mode
enable export org-mode to markdown/asciidoc
change keybinding to iedit-mode to iedit-mode-on-function (close issue #7)
tweak highlight-indentation & indent-guide initialization
tweak section header comments, make them compatible with outorg
remove init-xtra.el