Support wildcards '*' in package name.

One would use this command to get all Google apps logs:

```
pidcat.py com.google.*
```

One would use this command to get all AOSP apps logs:

```
pidcat.py com.android.*
```

One would use this command to get all ActionBarSherlock Sample apps logs:

```
pidcat.py com.actionbarsherlock.*
```

Thanks.

Start by tracing how pidcat.py currently filters log entries by package name and compare that behavior with the wildcard examples in the issue. Done means commands such as `pidcat.py com.google.*`, `pidcat.py com.android.*`, and `pidcat.py com.actionbarsherlock.*` select matching package logs.

Written by the indexing model from the issue text.