Add javadoc links to maven site

src/site/apt/gcloud-java-core/index.apt

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+GCloud Java Core: Common functionality for GCloud Java services. 
+
+ This module provides common functionality required by service-specific modules of this library.
+ This library is in a early stage of its development and may occasionally make backwards-incompatible changes,
+ but it is already usable.
+
+* Links
+
+   	* {{{https://github.com/GoogleCloudPlatform/gcloud-java/tree/master/gcloud-java-core}GitHub repository}}
+
+   	* {{{./apidocs/index.html?com/google/gcloud/package-summary.html}Javadocs}}
+

src/site/apt/gcloud-java-datastore/index.apt

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+GCloud Java Datastore: Idiomatic Java Client for Google Cloud Datastore. 
+
+ This is a Java Client for accessing Google Cloud Datastore.
+ This library is in a early stage of its development and may occasionally make backwards-incompatible changes,
+ but it is already usable.
+
+* Features
+
+	* {{{https://cloud.google.com/datastore/}Google Cloud Datastore}}
+
+* Links
+
+   	* {{{https://github.com/GoogleCloudPlatform/gcloud-java/tree/master/gcloud-java-datastore}GitHub repository}}
+
+   	* {{{./apidocs/index.html?com/google/gcloud/datastore/package-summary.html}Javadocs}}
+

src/site/apt/gcloud-java-examples/index.apt

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+GCloud Java Examples: Examples using GCloud Java services 
+
+ This library is in a early stage of its development and may occasionally make backwards-incompatible changes,
+ but it is already usable.
+
+* Links
+
+   	* {{{https://github.com/GoogleCloudPlatform/gcloud-java/tree/master/gcloud-java-examples}GitHub repository}}
+
+   	* {{{./apidocs/index.html?com/google/gcloud/examples/package-summary.html}Javadocs}}
+

src/site/apt/gcloud-java-storage/index.apt

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+GCloud Java Storage: Idiomatic Java Client for Google Cloud Storage.
+
+ This is a Java Client for accessing Google Cloud Storage.
+ This library is in a early stage of its development and may occasionally make backwards-incompatible changes,
+ but it is already usable.
+
+* Features
+
+	* {{{https://cloud.google.com/storage/}Google Cloud Storage}}
+
+* Links
+
+   	* {{{https://github.com/GoogleCloudPlatform/gcloud-java/tree/master/gcloud-java-storage}GitHub repository}}
+
+   	* {{{./apidocs/index.html?com/google/gcloud/storage/package-summary.html}Javadocs}}
+