Rake tasks that make development and testing easier.

To replace your locally installed RubyMotion/lib folder with a checkout of this repository, use the task "rake install". To revert to the official release, use "rake uninstall"
Adds a check in the `rake clean` process for nib/xib existence.

Fixes #78 by checking for the existence of a xib when attempting to clean a nib file. If a xib file exists, delete the nib; otherwise, delete it.
revert zombie env change because it's going to be implemented into the 'sim' executable instead
AH! Commas!
Merge pull request #98 from imkmf/78-nib-xib-rake-clean-edits

Adds a check in the `rake clean` process for nib/xib existence.
refactor #98
define RUBYMOTION_ENV earlier
move resources_dirs into the main config object
fix warning message where it would display "ld: warning: ObjC object file (./build/iPhoneSimulator-7.0-Development/objs/init.o) was compiled for iOS Simulator, but linking for MacOSX"

use "-mios-simulator-version-min" instead of "-miphoneos-version-min"
fix warning message where it would display "warning: no debug symbols in executable (-arch i386)"
delete trailing whitespaces
2.3
Merge pull request #76 from tkadauke/install_tasks

Rake tasks that make development and testing easier. Thanks, Thomas!