configuration: Allow using a list of strings in ignore configuration

This may feel more natural for some users, rather than embedding
multiple entries in a multi-line string.

docs/configuration.rst

@@ -140,7 +140,8 @@ Ignoring paths
 --------------
 
 It is possible to exclude specific files or directories, so that the linter
-doesn't process them.
+doesn't process them. They can be provided either as a list of paths, or as a
+bulk string.
 
 You can either totally ignore files (they won't be looked at):
 
@@ -153,6 +154,13 @@ You can either totally ignore files (they won't be looked at):
    all/this/directory/
    *.template.yaml
 
+ # or:
+
+ ignore:
+   - /this/specific/file.yaml
+   - all/this/directory/
+   - '*.template.yaml'
+
 or ignore paths only for specific rules:
 
 .. code-block:: yaml
@@ -165,6 +173,14 @@ or ignore paths only for specific rules:
        /this-file-has-trailing-spaces-but-it-is-OK.yaml
        /generated/*.yaml
 
+ # or:
+
+ rules:
+   trailing-spaces:
+     ignore:
+       - /this-file-has-trailing-spaces-but-it-is-OK.yaml
+       - /generated/*.yaml
+
 Note that this ``.gitignore``-style path pattern allows complex path
 exclusion/inclusion, see the `pathspec README file
 <https://pypi.python.org/pypi/pathspec>`_ for more details.