Update mail reading configuration.
Don't always need advanced java mode.
Don't always want projectile (when on slow computers, Windows
etc). Hence making it optional.
Added command to convert from HMLT to plain text.

- it uses either links or lynx.

- links is the default.
Now using my own html-to-text command for filtering HTML email.
Added git branch alias.

- improved performance of create-emacs-file-cache.