Add gradle.properties to keep some defaults

build.gradle

@@ -84,14 +84,6 @@ artifacts {
     archives sourcesJar
 }
 
-// Ensure we don't fail in CI or on a system without these values set in
-// ~/.gradle/gradle.properties
-if (!hasProperty( 'bintrayUser' ))
-  ext.bintrayUser = ''
-
-if (!hasProperty( 'bintrayKey' ))
-  ext.bintrayKey = ''
-
 bintray {
     user = project.bintrayUser
     key = project.bintrayKey

gradle.properties

@@ -0,0 +1,3 @@
+org.gradle.daemon=true
+bintrayUser=
+bintrayKey=