Added possibility to add multiple targets (e.g. one for ipad2, one for iphone5, one for iphone6 etc) in ti_args

[emiloberg]

This small patch adds the possibility to add multiple targets in ti_args (e.g one for ipad2, one for iphone5, one for iphone6 etc).

Currently, the property names (ios and android) doubles as the platform names:

var ti_args= {
  ios: ['-p','ios','-T', 'simulator', '--device-id','F2B9C750-6BCC-4BC0-8CE8-A5D1FA30A036'],
  android: ['-p','android', '-T','device'],
  default: ['-p','ios'] 
};

This pull request changes this so that the platform names are fetched from the second value in the value array. This makes it possible to define targets such as:

var ti_args= {
  iphone5: ['-p','ios','-T', 'simulator', '--device-id','AAAAAAAA-BBBB-CCCC-DDDD-EEEEEEEEEEEE'],
  iphone6: ['-p','ios','-T', 'simulator', '--device-id','FFFFFFFF-GGGG-HHHH-IIII-JJJJJJJJJJJJ'],
  ipad2: ['-p','ios','-T', 'simulator', '--device-id','KKKKKKKK-LLLL-MMMM-NNNN-OOOOOOOOOOOO'],
  android: ['-p','android', '-T','device'],
  default: ['-p','ios'] 
};

and then use it as

grunt dev -p iphone6

[dbankier]

Sorry for the loooong delay. Ignored this project for a bit. Thanks.