Don't accidentally set buffer-local `mode-line-format'.

* lisp/tracking.el (tracking-mode): Use `setq-default' and
  `default-value' for `mode-line-format'.
Merge pull request #96 from TaylanUB/tracking-mode

Don't accidentally set buffer-local `mode-line-format'.
Update build procedure to makefile.

I think I'm now at the point where I revamp the build system for
every release. Does that give me some sort of achievement?
Bump to version 1.5
Use the right syntax table
Merge pull request #99 from wasamasa/bugfix-color-nicks-syntax-table

Use the right syntax table
Fix #100
Merge pull request #102 from jorgenschaefer/bugfix-color-nicks-quitters

Fix #100
Fix #101
Fix #103
Make search case-sensitive

Before this change there was a minor annoyance involved into the
matching of nicks in messages.  If the nick in question had uppercase
letters, but could still be found with an case-insensitive search in a
message, it got highlighted with the invalid foreground color nil
because the nick with the different upcasing couldn't be found in the
nick-color mapping.  This issue manifested itself in numerous "Invalid
face attribute :foreground nil" error messages in the *Messages* buffer.