Add new "sample" task

Having to browse the sample.project.clj file online or keep copy of it
locally is a bit of a hassle. This patch makes it easy to view the
sample.project.clj file from the comfort of the terminal.
orphaned release notes?
bump cljsbuild-version in subproject => 0.3.4-SNAPSHOT (ref gh-242)
Default :output-wrapper to true when :optimizations = :advanced, fixes gh-201
Merge pull request #232 from noprompt/master

Add new "sample" task
Let hard compilation failures (i.e. failures loading Clojure files) fail the broader build (gh-234)
0.3.4 release notes draft
fail test subtask if any :test-command vector contains non-string values, fixes gh-243
auto-discover version of lein-cljsbuild being used, fixes gh-242
final 0.3.4 release notes
0.3.4
Merge remote-tracking branch 'upstream/master'