Added missing dependency declarations.

Build has worked so far because we relied on the dependencies being pulled in transitively but it's best practice not to do so.

spring-data-mongodb-parent/pom.xml

@@ -187,6 +187,11 @@
         <artifactId>spring-tx</artifactId>
         <version>${org.springframework.version.range}</version>
       </dependency>
+      <dependency>
+        <groupId>org.springframework</groupId>
+        <artifactId>spring-context</artifactId>
+        <version>${org.springframework.version.range}</version>
+      </dependency>
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-orm</artifactId>

spring-data-mongodb/pom.xml

@@ -18,10 +18,22 @@
 	<dependencies>
 
 		<!--  Spring -->
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-tx</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-context</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-beans</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-core</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-expression</artifactId>