Grails 3.1.0: create-app command doesn't generate .gitignore

[nobeans]

From 3.1.0, a create-app command doesn't generate .gitignore file, though v3.0.13 works well.

[nobeans]

It seems to be caused by DirectoryScanner's change.

• https://issues.gradle.org/browse/GRADLE-1883
• https://svn.apache.org/repos/asf/ant/core/trunk/src/main/org/apache/tools/ant/DirectoryScanner.java

I think the profile should be able to include all files under skeleton and etc. even if it's usually considered as temporary files.