chore(travis): change travis script and include coveralls

chore(travis): change travis script and include coveralls · mgonto/restangular@ca9856a

Original file line number	Diff line number	Diff line change
`@@ -160,7 +160,7 @@ module.exports = function(grunt) {`
`160`	`160`
`161`	`161`	`grunt.registerTask('test-debug', ['karma:debug']);`
`162`	`162`
`163`		`-grunt.registerTask('travis', ['karma:travis', 'karma:travisUnderscore']);`
	`163`	`+grunt.registerTask('travis', ['karma:travis', 'karma:travisUnderscore', 'coveralls']);`
`164`	`164`
`165`	`165`	`grunt.registerTask('changelog', ['conventionalChangelog']);`
`166`	`166`