Allow for $LEIN_TRAMPOLINE_WARMUP.

[ci skip]
Bump reply for (exit) fix
fix bug when adding exclusions to dependencies with :displace metadata
a typo
Merge pull request #848 from jaceklaskowski/master

Fix for a typo
don't need a meta-merge to combine exclusion
Fix font-lock in bin/lein
Remove deprecated conj-dependencies function.
Accept ^:replace metadata on *env*; don't always want to merge.
Accept optional not-found arg in lookup-alias.
Better docstrings in leiningen-core.
Move AOT of :main into uberjar task. Remove :skip-aot.
Check Clojars releases repository instead of classic. Fixes #241.
Fix usages of when for return values.
Fix global exclusions test broken by meta-merge changes.
Fix error message when there's an arity mismatch in apply-task.
Add classic repo to Leiningen's own project.clj.
Fix `lein deploy clojars` issue by bumping clj-http in order to use repeatable http entities
Accept string for :license. Fixes #853.
Add :port option to headless repl task.

We can now specify the port to use when creating a headless REPL.

Example -
lein repl :headless :port 4005