Add a basic .gitignore generated via grails integrate-with --git
Upgrade contact-form plugin to modern dependencies:
* grails 2.3
* grails-plugins:
  * mail 1.0.1
  * jcaptcha 1.2.1
  * jquery 1.10.2

Code compiles but tests currently fail due to changes made in grails plugins conventions from grails 1.3->2.3.
Convert plugin query paths to Grails 2.3 style:
1. create -> /contactForm/create
2. ajaxCreate -> /contactForm/_create
Convert ContactFormControllerTests to Grails 2.3 testing style.
Replace use of deprecated ConfigurationHolder with injected grailsApplication property.
Allow POST to validate.
Merge branch 'topic-update-dependencies-for-grails-2.3'