feat: Support to read from Munki log

This adds support to read from Munki's default log file.

First Issue

Currently with the first regex pattern will remove "Installing" from the DEP Notify output. Ideally we use a capture group to get everything before Installing and remove it.

IE - The following regex

let installerRegEx = try NSRegularExpression(pattern: "(.*?)Installing")

with the following log line

Sep 01 2017 10:01:59 -0500 Installing Firefox.app (1 of 1)

results in the following output

 Firefox.app (1 of 1)

and it should be.

Installing Firefox.app (1 of 1)

Second Issue

Munki allows admin's to customize the log path. I think a certain @Mactroll has some CFPreferences code to capture the LogFile key from the ManagedInstalls domain.