Bug 445991, bump nightly version to 3.0b1pre after 3.0a2 builds, r=dmose on IRC

mail/app/module.ver

@@ -2,7 +2,7 @@ WIN32_MODULE_DESCRIPTION=Mozilla Thunderbird
 WIN32_MODULE_PRODUCTNAME=Thunderbird
 WIN32_MODULE_NAME=Thunderbird
 WIN32_MODULE_PRODUCTVERSION=3,0,0,0
-WIN32_MODULE_PRODUCTVERSION_STRING=3.0a2pre
+WIN32_MODULE_PRODUCTVERSION_STRING=3.0b1pre
 WIN32_MODULE_COPYRIGHT=©Thunderbird and Mozilla Developers, according to the MPL 1.1/GPL 2.0/LGPL 2.1 licenses, as applicable.
 WIN32_MODULE_COMPANYNAME=Mozilla Messaging
 WIN32_MODULE_TRADEMARKS=Mozilla

mail/config/version.txt

@@ -1 +1 @@
-3.0a2pre
+3.0b1pre