[VersionBump] 1.19.0, fairly late

The core plugins whose version was attached to GS's were reseted to 2.0.0.

2.0.0 was chosen as reset version for plugins because it is higher than
  the one that was set by inheriting GS version. Furthermore, it's a
  major change from prior plugin versioning system thus it also makes
  semantic sense.

Justification for version bump:

== GS ==
9a4ab31f26 1.19.0
c13b935201 1.18.3
c13b935201 1.18.2
18fc39d2cf 1.18.1
c083a8bcc2 1.18.0
e8783d46d0 1.17.1
d9a42550ff 1.17.0
1536d3ef29 1.16.0
c03ed457a6 1.15.0
d2e6519bad 1.14.2
fe411e8138 1.14.1
b17e0b4169 1.14.0
daa5f87fd4 1.13.0
d75b5d2f4a 1.11.7
f6dbf66983 1.11.6
6cf674f8f8 1.11.5
7845a09b34 1.11.4
e4d432295d 1.11.3
339204f1ee 1.11.2
a4e679a118 1.11.1
7967db6ff5 1.11.0
bc030da320 1.10.1
9cc7df51d6 1.10.0
bf7f17474d 1.9.2
8a07edec5f 1.9.1
0042971d74 1.9.0
6b5450b7e6 1.8.0
5dcc98d1c6 1.7.0
e6667db0cd 1.6.0
3290227b50 1.5.0
a59c439b46 1.4.0
496ab8c920 1.3.10
986030060b 1.3.9
1d529c021a 1.3.8
f89c052cf8 1.3.7
38f2ecefac 1.3.6
e473937cb9 1.3.5
9a39ebe66f 1.3.4
ddc3cecfc0 1.3.3
2b43d484eb 1.3.2
e8e487187e 1.3.1

== Plugins ==
XMPP plugin
e0887220b0 bump patch
e186ad57d0 bump patch

OStatus
e186ad57d0 bump patch

Nodeinfo
ceae66a30f bump minor
586fb5a517 bump major
195296846e bump minor

plugins/ActivitySpam/ActivitySpamPlugin.php

@@ -36,7 +36,7 @@ if (!defined('STATUSNET')) {
 
 /**
  * Check new notices with activity spam service.
- * 
+ *
  * @category  Spam
  * @package   StatusNet
  * @author    Evan Prodromou <evan@status.net>
@@ -46,6 +46,8 @@ if (!defined('STATUSNET')) {
  */
 class ActivitySpamPlugin extends Plugin
 {
+    const PLUGIN_VERSION = '2.0.0';
+
     public $server = null;
     public $hideSpam = false;
 
@@ -67,7 +69,7 @@ class ActivitySpamPlugin extends Plugin
 
         // Let DB_DataObject find Spam_score
 
-        common_config_set('db', 'class_location', 
+        common_config_set('db', 'class_location',
                           common_config('db', 'class_location') .':'.dirname(__FILE__));
 
         return true;
@@ -94,7 +96,7 @@ class ActivitySpamPlugin extends Plugin
 
     /**
      * When a notice is saved, check its spam score
-     * 
+     *
      * @param Notice $notice Notice that was just saved
      *
      * @return boolean hook value; true means continue processing, false means stop.
@@ -111,7 +113,7 @@ class ActivitySpamPlugin extends Plugin
             $this->log(LOG_INFO, "Notice " . $notice->id . " has spam score " . $score->score);
 
         } catch (Exception $e) {
-            // Log but continue 
+            // Log but continue
             $this->log(LOG_ERR, $e->getMessage());
         }
 
@@ -171,7 +173,7 @@ class ActivitySpamPlugin extends Plugin
 
         return true;
     }
-    
+
     /**
      * Map URLs to actions
      *
@@ -218,7 +220,7 @@ class ActivitySpamPlugin extends Plugin
     function onPluginVersion(array &$versions)
     {
         $versions[] = array('name' => 'ActivitySpam',
-                            'version' => GNUSOCIAL_VERSION,
+                            'version' => self::PLUGIN_VERSION,
                             'author' => 'Evan Prodromou',
                             'homepage' => 'https://git.gnu.io/gnu/gnu-social/tree/master/plugins/ActivitySpam',
                             'description' =>