Do not attempt to load $2 if only inspecting

On Mavericks command line, the following would happen:
 ./ipa_sign -i File.ipa
./ipa_sign: line 50: $2: unbound variable
After moving the line:
PROVISION="$(realpath "$2")"
Into the if statement , it works again
Merge branch 'master' of https://github.com/kalperin/ota-tools

Conflicts:
	ipa_signv - Resolved by moving PROVISION="$(realpath "$2")" into if statement
Merge pull request #1 from Norod/master

Thank you + Minor update (foo, .xcent, fix "$2: unbound variable")