Added support for --exclude to the git-config support.

In contrast to the -x/--exclude option that can be given on the command
line, --exclude can not be set multiple times when used with git-config.

Luckily, the same behavior can be attained by using the pipe ("|")
character. Ie, specifying the following on the command line:

-x "hello.txt" -x "goodbye.txt"

is the same thing as:

-x "hello.txt|goodbye.txt"

when sent to git-config or the command line.

gitinspector/config.py

@@ -32,9 +32,12 @@ def __read_git_config__(variable, default_value):
 		setting = setting.readlines()[0]
 		setting = setting.decode("utf-8", "replace").strip()
 
-		if setting == "True" or setting == "true" or setting == "1":
-			return True
-		elif setting == "False" or setting == "false" or setting == "0":
+		if default_value == True or default_value == False:
+			if setting == "True" or setting == "true" or setting == "1":
+				return True
+			elif setting == "False" or setting == "false" or setting == "0":
+				return False
+
 			return False
 		elif setting == "":
 			return default_value
@@ -48,6 +51,10 @@ def init(run):
 	missing.set_checkout_missing(__read_git_config__("checkout-missing", False))
 	extensions.define(__read_git_config__("file-types", ",".join(extensions.get())))
 
+	exclude = __read_git_config__("exclude", None):
+	if exclude != None:
+		filtering.add(exclude)
+
 	if not __read_git_config__("format", format.get_selected()):
 		raise format.InvalidFormatError(_("specified output format not supported."))