Re-target to MacOS 10.7 SDK. Add timeout functionality.

[mpontillo]

This project was no longer compiling with the latest Xcode. The first 2 commits clean that up.

The third commit adds two command-line parameters:

-t <timeout> -x

If -t is used by itself, after 2 seconds plus the timeout have elapsed, deviceconsole will check if any more logs have been written out. If not, the program exits. The -x parameter modifies that behavior by exiting immediately after the number of seconds specified in the -t parameter have elapsed.

Change-Id: Ia75390332506beebce3fb490fba29e45a0caee24