fixed import path

Got error:
`/Users/seven/Dropbox/git/FinderMenu/FinderMenu/main.m:12:9: fatal error: '../mach_inject_bundle/mach_inject_bundle.h' file not found
#import "mach_inject_bundle/mach_inject_bundle.h"
        ^
1 error generated.`

Running on OSX 10.8.3