Consistently use double quotes (even if no interpolation needed)

Includes upgrade to Hibernate ORM 5.3.5, EclipseLink 2.7.3, Selenium HtmlUnit Driver 2.32.1, Jetty 9.4.12 RC2.

spring-context/spring-context.gradle

@@ -5,7 +5,7 @@ apply plugin: "groovy"
 dependencies {
 	compile(project(":spring-aop"))
 	compile(project(":spring-beans"))
-	compile(project(':spring-core'))
+	compile(project(":spring-core"))
 	compile(project(":spring-expression"))
 	optional(project(":spring-instrument"))
 	optional("javax.annotation:javax.annotation-api:1.3.2")