Added 7zip and package.bat for build server

Libraries/7zip/readme.txt

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+7-Zip Command line version 9.20
+-------------------------------
+
+7-Zip is a file archiver with high compression ratio.
+7za.exe is a standalone command line version of 7-Zip.
+
+7-Zip Copyright (C) 1999-2010 Igor Pavlov.
+
+Features of 7za.exe: 
+  - High compression ratio in new 7z format
+  - Supported formats:
+      - Packing / unpacking: 7z, xz, ZIP, GZIP, BZIP2 and TAR 
+      - Unpacking only: Z, lzma
+  - Highest compression ratio for ZIP and GZIP formats.
+  - Fast compression and decompression
+  - Strong AES-256 encryption in 7z and ZIP formats.
+
+7za.exe is a free software distributed under the GNU LGPL.
+Read license.txt for more information.
+
+Source code of 7za.exe and 7-Zip can be found at
+http://www.7-zip.org/
+
+7za.exe can work in Windows 95/98/ME/NT/2000/2003/2008/XP/Vista/7.
+
+There is also port of 7za.exe for POSIX systems like Unix (Linux, Solaris, OpenBSD, 
+FreeBSD, Cygwin, AIX, ...), MacOS X and BeOS:
+
+http://p7zip.sourceforge.net/
+
+
+  This distributive packet contains the following files:
+
+  7za.exe       - 7-Zip standalone command line version.
+  readme.txt    - This file.
+  license.txt   - License information.
+  7-zip.chm     - User's Manual in HTML Help format.
+
+
+---
+End of document