Add support for UTF-8

Some applications, like Übersicht use extended characters, causing an exception in patchstarter.py:

```
ecrist@mac:~/Patch-Starter-Script-> python patchstarter.py -o . /Applications/Übersicht.app
Traceback (most recent call last):
File "patchstarter.py", line 263, in
main()
File "patchstarter.py", line 102, in main
filename = '{}.json'.format(app_id)
UnicodeEncodeError: 'ascii' codec can't encode character u'\u0308' in position 1: ordinal not in range(128)```

Start in patchstarter.py at line 102, where the application identifier is formatted into a JSON filename, and trace how the application path is decoded and used. Reproduce the command with an application path containing extended characters, then verify that patchstarter.py completes and creates the expected patch definition without a UnicodeEncodeError.

Written by the indexing model from the issue text.