RyanTM and I reduced the run time of the 'lein help' command
by making it just parse the task source code files instead of actually
requiring/compiling them (second try).

This results in a 70% speed improvement on my machine (14s to 4s).
update bultitude dependency to 0.2.5

0.2.5 incorporates the changes to bultitude that @davidegrayson's changes depend on, so we need to have leiningen depend on that version now.
Merge pull request #1 from ryantm/patch-1

update bultitude dependency to 0.2.5
Merge remote-tracking branch 'DavidEGrayson/lein_faster'

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# the commit.
Fall back to defn-level help summaries if ns-level are not found.
Update plugin guide.