Add a blurb; fix some double-spaces in the changelog

ChangeLog

@@ -1,4 +1,14 @@
 Changes in version 0.2.2.25-alpha - 2011-04-28
+  Tor 0.2.2.25-alpha fixes many bugs: hidden service clients are more
+  robust, routers no longer overreport their bandwidth, Win7 should crash
+  a little less, and NEWNYM (as used by Vidalia's "new identity" button)
+  now prevents hidden service-related activity from being linkable. It
+  provides more information to Vidalia so you can see if your bridge is
+  working. Also, 0.2.2.25-alpha revamps the Entry/Exit/ExcludeNodes and
+  StrictNodes configuration options to make them more reliable, more
+  understandable, and more regularly applied. If you use those options,
+  please see the revised documentation for them in the manual page.
+
   o Major bugfixes:
     - Relays were publishing grossly inflated bandwidth values because
       they were writing their state files wrong--now they write the
@@ -14,8 +24,8 @@ Changes in version 0.2.2.25-alpha - 2011-04-28
       destination by TrackHostExits if they fail to reach that exit node.
       Fixes bug 2999. Bugfix on 0.2.0.20-rc.
     - Fix crash bug on platforms where gmtime and localtime can return
-      NULL. Fixes part of bug 2077. Bugfix on all versions of Tor. Found
-      by boboper.
+      NULL. Windows 7 users were running into this one. Fixes part of bug
+      2077. Bugfix on all versions of Tor. Found by boboper.
 
   o Security and stability fixes:
     - Don't double-free a parsable, but invalid, microdescriptor, even if