Fix flyspell dict switch problem and enable it only after first change

Add a debug message for observing temporary buffers and their mode.
Move grep-find-command in more appropriate section

Wrap YASnippet code for Org mode in a (try-require 'yasnippet).
`find-grep-dired' case insensitivity

Add `-H' to grep options, as adviced in doc strings.
Fix `leuven-grep' (C-c 4) to start from current directory
Improve doc of how to install Emacs Leuven
Use `recover-this-file' for the name of the face
Use `rgrep' instead of `grep-find' (bound to `C-c 3')
Slightly improve list of key bindings (different tables)
Diminish wait times after some verbose messages