Merge tag '0.6.0-beta.5' into develop

pallet-lein-0.6.0-beta.5
Updated version for next release cycle
Clarify :pallet profile usage
Fix hooks so plugins aren't clobbered

The hooks were returning nil for plugin dependencies, which meant plugins
loaded via profiles were failing.
Make logging config more comprehensive
Fix dependency cleaning

Conflicting dependencies were only being removed when they appeared sequentially
in the :dependencies vector.
Add project with profiles to debug output
Update to pallet 0.8.0-beta.3
Update to pallet 0.8.0-beta.4
Updated project.clj, release notes and readme for 0.6.0-beta.6
Merge branch 'release/0.6.0-beta.6'