Add path inclusion instructions
Merge pull request #48 from burntcookie90/master

Add path inclusion instructions
[pidcat] Display package:process_name in process birth/death messages

Summary: Making sense of a birth/death message is made easier by specifying which process it applies to, and not just
the component or the pid.

Test Plan: Run, monitor message lines when cycling a multi-process app, inject None as a process name to check resilience.
[pidcat] Nicer style for package_line handling in proc death messages.

Summary: Makes for a nicer read.

Test Plan: Run on multi-process app, see death lines properly formatted.
[pidcat] Allow package to specify a process as well

Summary: Android apps can use multiple processes (eg, chrome), which are identified as <package_name>:<process_name>. The names
are defined in the manifest.
The main process is referred to as simply <package_name> by android.
Add the ability to specify a target process as part of what was until now the package name in pidcat, or all processes
if no process is specified.

Usage:
 * pidcat <package_name> will match all of an app's processes.
 * pidcat <package_name>:<process_name> will match a given named process.
 ** In particular, pidcat <package_name>: will ensure only the app's main/default process is matched.

Test Plan: Run the script, try out with no process, empty (aka default) process, named process. Try multiple entries.