Delete install command's -T option.

Because Mac OS X install command has no -T option.

$ install -T
install: illegal option -- T
usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
               [-o owner] file1 file2
       install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]
               [-o owner] file1 ... fileN directory
       install -d [-v] [-g group] [-m mode] [-o owner] directory ...
Merge pull request #67 from master-q/feature/support_osx

Delete install command's -T option.