Add hello-world sample. Clean up samples/README.md.
method-param interceptor now accepts paths

Where previously method-param would only look for method params in
:query-params, the interceptor is now configurable to look for paths to
anywhere in the request.

NOTE: This new version of the interceptor does not break the previous
API.
Remove duplicate version of method-param
Merge pull request #258 from pedestal/method-param

method-param interceptor now accepts paths
Merge pull request #256 from pedestal/add-hello-world-sample

Add hello-world sample
Merge branch 'master' of github.com:pedestal/pedestal into csrf-protection
Cleanup deps; Update tests for new clj-http