Update Info.plist
Update Info.plist

- add two new type to allow displaying .string files and README and LICENSE files since OS X sometime report them as public.unix-executable

- Testing instructions:

// Testing.
//
// Reload them after install in /Libary/QuickLook/ or ~/Libary/QuickLook/ :
// qlmanage -r
//
// Test them with -d4 to see debug information such as mime types and quicklook installed.
// ie.
// qlmanage -p -d4 /Users/markf/Downloads/quicklook\ plugins/qlstephen-1.4.4/LICENSE
whomwah/qlstephen