title: What is the different between /build and build/ in gitignore?
body: <p>I notice the recommendation for .gitignore for Android in <a href="https://stackoverflow.com/a/17803964/3286489">https://stackoverflow.com/a/17803964/3286489</a> have both <code>/build</code> and <code>build/</code>. What are their differences? Should we have both, or just one will do?</p>