Feature/plat 229 gruntjs update

[gusliedke]

http://jira.comicrelief.com/browse/PLAT-229

[gusliedke]

@bimsonz it's bullet proof!
New Grunt tasks

In campaign
    `grunt campaign_base`
    `grunt build`

In rnd17
    `grunt rnd17 --target=themes/rnd17/config.rb`
    `grunt build_all`

[gusliedke]

Can we make build.xml to run grunt build in Campaign repo and grunt build_all in Rnd17 ?

[bimsonz]

@gusliedke So, to keep the gruntfile with the profile ive moved it back and updated a few things.. please review this and let me know if youre happy and ill merge it!

we can add <property name="grunt.cmd" override="true" value="build"/>
to the rnd17 build.xml build.properties to override the value to build_all and this should be done :)