[iOS] Use Target#rake to execute Watch app launch task.
[iOS] Use Target#rake to execute Watch app launch task.

katsuyoshi/RubyMotion,katsuyoshi/RubyMotion,HipByte/RubyMotion,jjaffeux/RubyMotion,jjaffeux/RubyMotion,jjaffeux/RubyMotion,beni55/RubyMotion,HipByte/RubyMotion,hboon/RubyMotion,beni55/RubyMotion,beni55/RubyMotion,incbee/RubyMotion,hboon/RubyMotion,beni55/RubyMotion,katsuyoshi/RubyMotion,katsuyoshi/RubyMotion,incbee/RubyMotion,HipByte/RubyMotion,hboon/RubyMotion,incbee/RubyMotion,jjaffeux/RubyMotion,incbee/RubyMotion