Enhancements

[bguerin]

Plugin now works fully with both CasperJS 1.0.x and CasperJS 1.1.x (tested with 1.0.4 and 1.1.0-beta3) All integration tests run with CasperJS 1.1.x, except one which run with CasperJS 1.0.x to ensure plugin remains compatible

Here are the details of modifications :

• Refactor all integration tests to run under CasperJS 1.1.x (this will fix #15)
• Plugin will now find its files under src/test/casperjs instead of src/test/js
• Plugin will now handles appropriate default values and both a light directory structure (ie src/test/casperjs/*.{js,coffee} as test scripts) and a full directory structure (src/test/casperjs/pre.js as pre script, src/test/casperjs/post.js as post script, src/test/casperjs/includes/*.js as includes scripts and src/test/casperjs/scripts/*.{js,coffee} as test scripts). Of course, all the default values (for pre/post scripts, includes and scripts directories) can be overriden in the POM configuration.
• Plugin can now launch a specific test via -Dcasperjs.test=MyTest or only some via <includes> and <excludes> in the POM configuration
• All native options of CasperJS (--verbose, --log-level, --engine) are supported (fix #10 and #6)
• Plugin is now able to find the CasperJS runtime path via Maven toolchains
• An integration test exists for all options
• the README now presents all the options and behaviours