bump version in dev after tagging train

ChangeLog

+train-2012.07.20: (in progress)
+  * 
+
 train-2012.07.06:
   * refinement of all user facing language: #1889, #1905, #1675, #1923, #1925
   * requiredEmail feature removed: #1760

scripts/browserid.spec

 %define _rootdir /opt/browserid
 
 Name:          browserid-server
-Version:       0.2012.07.06
+Version:       0.2012.07.20
 Release:       1%{?dist}_%{svnrev}
 Summary:       BrowserID server
 Packager:      Pete Fritchman <petef@mozilla.com>