Update documentation for plugin groupId and compatibility

Corrects the plugin groupId in installation instructions from 'com.symentis' to 'org.grails.plugins', updates the Grails and plugin version compatibility table, removes outdated groupId change notes, and reorders the changelog include in the documentation index.

Author: jamesfredley

plugin/src/docs/index.adoc

@@ -19,8 +19,6 @@ Other formats: link:audit-logging-{VERSION}.pdf[PDF], link:audit-logging-{VERSIO
 
 include::introduction.adoc[]
 
-include::changelog.adoc[]
-
 include::installation.adoc[]
 
 include::upgrading.adoc[]
@@ -32,3 +30,5 @@ include::usage.adoc[]
 include::stamping.adoc[]
 
 include::implementation.adoc[]
+
+include::changelog.adoc[]

plugin/src/docs/installation.adoc

@@ -2,12 +2,10 @@
 === Dependencies
 Add to your build.gradle project dependencies block:
 
-WARNING: Due to the move to Maven Central, the plugin groupId has changed from org.grails.plugin to com.symentis.
-
 [source,groovy]
 ----
 dependencies {
-   compile 'com.symentis:audit-logging:{VERSION}'
+   compile 'org.grails.plugins:audit-logging:{VERSION}'
 }
 ----
 Then run the following to refresh gradle dependencies: 

plugin/src/docs/introduction.adoc

@@ -9,6 +9,7 @@ It also provides a convenient way to add Update and Create user stamping by exte
 [cols="1,2",width="50%",options="header,footer"]
 |====================
 |Grails Version  | Audit Logging Plugin Version
+|7.0.x | 6.0.x
 |4.0.0 and later | 5.0.0 (participating in Transactions). This is the recommended version if you use Grails 4.
 |4.0.x | 4.0.x
 |3.3.x | 3.0.x
@@ -21,7 +22,7 @@ It also provides a convenient way to add Update and Create user stamping by exte
 === GORM Compatibility
 
 This plugin is GORM agnostic, so you can use it with the GORM implementation of your choice
-(Hibernate 4 or 5, MongoDB, etc.).
+(Hibernate 5, MongoDB, etc.).
 
 Please note, that only Hibernate5 is tested during development. If an issue occurs with your ORM mapper,
 please file a GitHub issue.

plugin/src/docs/upgrading.adoc

@@ -1,7 +1,6 @@
 == Upgrading to 5.0.x
 
 ** The 5.0.0 version has some significant changes to the 4.0.x version.
-* The groupId of the plugin has changed from org.grails.plugin to com.symentis
 * The configuration keys are the same as in 4.0.x
 * The mechanism to audit log transaction data has changed. We now participate in transactions and queue up audit logs. The audit logs are flushed with the current transaction. If the current transaction fails, no audit logs of this transaction are committed. Due to this major change, the plugin is currently not ORM agnostic and for now depends on Hibernate. As the plugin itself does not support other GORM implementations like Mongo (see #179), this shouldn't affect current projects.