DDF-294 Added casperjs to grunt build and an initial example test

refactored express web server to have proxy and mock modes
added mock data
DDF-294 changed the grunt-casperjs plugin to our own fork to fix issues
DDF-336: added SecurityServletFilter to standard UI web.xml
DDF-294 added check for python to disable casperjs if it is not installed
DDF-333: Made modifications for Standard UI configuration to use proxy service.
DDF-333: Modified Standard UI to use proxy as embedded; also added additional bundle to run proxy jars.
DDF-333: Added constant for base of servlet URI
DDF-333: Wrong destroy method was being called.
DDF-333: Remove hardcoding of localhost address
DDF-333: Merge branch 'ddf-333' of http://github.com/codice/ddf-ui into ddf-333

Conflicts:
	search-ui/standard/src/main/java/org/codice/ddf/ui/searchui/standard/properties/ConfigurationStore.java