add --debugjs (don´t uglify the js) option to cordova/build.sh for easie...

...r remote debugging.

added dist-dbg to grunt which is nearly the same as dist but uses shell:dev instead and doesn´t uglify the JS.
Added --dbgjs to cordova/build.sh which calls dist-dbg instead of dist when used as i am debugging the js remote on the phone via chrome webview debugger and uglified js is pretty pointless for that.