Fix pom with non-default :default profile

Unmerge expanded its profiles based on the profiles in the project
map (which don't include :default), rather than profiles in the
:profiles metadata.

The :default keys were also hard coded in the pom generation, so ignored
any additions.

This is in support of https://github.com/lynaghk/cljx/pull/48
Restore previous order of dependencies in pom
Merge remote-tracking branch 'hugoduncan/fix-unmerge-with-meta-profiles' into profiles-from-plugins

Conflicts:
	src/leiningen/pom.clj