[iOS] Fail build if one of the resources is a dir called `Resources'.
[iOS] Fail build if one of the resources is a dir called `Resources'.

Fixes http://hipbyte.myjetbrains.com/youtrack/issue/RM-450.

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