Update project to recommended settings for Xcode 4.3.1
Update project to recommended settings for Xcode 4.3.1

gonefish/MMMarkdown,isaacroldan/MMMarkdown,jonesgithub/MMMarkdown,babbage/MMMarkdown,gonefish/MMMarkdown,isaacroldan/AttributedMarkdown,AgileBits/MMMarkdown,mjzac/MMMarkdown,mobilejazz/MMMarkdown,mobilejazz/MMMarkdown,cnbin/MMMarkdown,cnbin/MMMarkdown,isaacroldan/AttributedMarkdown,isaacroldan/AttributedMarkdown,mdiep/MMMarkdown,albertbori/MMMarkdown,albertbori/MMMarkdown,jonesgithub/MMMarkdown,iosdev-republicofapps/MMMarkdown,iosdev-republicofapps/MMMarkdown,isaacroldan/AttributedMarkdown,1aurabrown/MMMarkdown,isaacroldan/AttributedMarkdown,AgileBits/MMMarkdown,mdiep/MMMarkdown,isaacroldan/MMMarkdown,albertbori/MMMarkdown,1aurabrown/MMMarkdown,babbage/MMMarkdown,mjzac/MMMarkdown