NN-1947 Add configuration so software using this library can alter the URL Query Parameter
- Support setting the authorization header names just in case someone needs to change 'em.
- Move RequestConstants into RequestConfiguration now that no other code uses the Constants.
- Add RequestConfiguration Builder so ReqConf is immutable.
- Update hurl CLI to include header configurability
Merge pull request #37 from bazaarvoice/jrogers-add-config

Jrogers add RequestConfiguration to permit customizing headers and query parameter.
Upgrade maven-release-plugin

We are having trouble with release tags pushed before committing the pom changes, which is fixed in 2.5+ https://jira.codehaus.org/browse/MRELEASE-812
add release.properties to .gitignore
branch admin -prepare release jersey-hmac-auth-0.14
branch admin -prepare for next development iteration
modified hurl to accept auth config
  via file at ~/.hurl/default.conf
  also added --configure to override them temporarily
  updated cli readme
addressed comments from pull request #36

Change-Id: I60102c295399fc5e499bb62c31534cc259530314