Adjust deployment targets to 10.6+ and iOS 8+
Adjust deployment targets to 10.6+ and iOS 8+

cnbin/MMMarkdown,iosdev-republicofapps/MMMarkdown,isaacroldan/MMMarkdown,iosdev-republicofapps/MMMarkdown,albertbori/MMMarkdown,AgileBits/MMMarkdown,AgileBits/MMMarkdown,mdiep/MMMarkdown,isaacroldan/MMMarkdown,albertbori/MMMarkdown,albertbori/MMMarkdown,cnbin/MMMarkdown,mdiep/MMMarkdown,gonefish/MMMarkdown,gonefish/MMMarkdown