.emacs: Some trivial changes.

- Disabled default key bind for toggle-input-method.
- Changed size and geometry of my-full-screen.
- Use default major-mode (text-mode) on *.txt.
- Generate stand-alone HTML file by pandoc on markdown-mode.
- Generate ODT file (not DOCX file) by org-export-as-odt.
- Disabled inline image on org-mode.
- Show tab-stop on ruler-mode.
.bashrc: Some trivial changes.

- Defined $SHELL.
- Deleted path for ~/.cabel from $PATH.
- Added filename pattern "*#" to file to clean by clean().
- Fixed bug that print_prompt() didn't update title-bar under screen(1).