Add PostgreSQL RDBMS support

lib/npgsql/LICENSE.txt

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+Copyright (c) 2002-2013, The Npgsql Development Team
+
+Permission to use, copy, modify, and distribute this software and its documentation for any purpose, without fee, and without a written agreement is hereby granted, provided that the above copyright notice and this paragraph and the following two paragraphs appear in all copies.
+
+IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

lib/npgsql/README.md

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+Npgsql - .NET Data Provider for PostgreSQL
+=============
+
+###What Is Npgsql?
+
+Npgsql is a .Net Data Provider for PostgreSQL. It allows you to connect and interact with PostgreSQL server using .NET.
+
+
+###Project Information
+
++   [Offical Site][1]
++   [Npgsql source code @ GitHub][2]
++   [Available on NuGet Gallery][3]
++   [Wiki - Usage and other information][4]
+
+
+###Developers
+
+Developers who contributes to Npgsql currently or in past, in no particular order:
+    
++   Brar Piening
++   Francisco Figueiredo Jr.
++   Ben Clewett
++   Daniel Morgan
++   Dave Page
++   Ulrich Sprick
++   Glen Parker
++   Josh Cooley
++   Jon Asher
++   Chris Morgan
++   Thilo Utke
++   Hiroshi Saito
++   Shay Rojansky
+
+###License
+
+Refer LICENSE.txt for more information on license terms.
+
+###Code history
+
+On December 2nd, [we committed a change][5] to restructure Npgsql code. This change modified file locations and unfortunately made the complete modification history of those files to not be available anymore through GitHub interface directly. [This stackoverflow post][6] documents a way to access the history before the rename: You just need to access the object tree **before** the rename and then you can see the rest of the file history.
+In the case of this rename, this is the tree: https://github.com/npgsql/Npgsql/tree/2f8928e4dee59275767de0df2ec41a654744a3bc
+
+This will help future searches for the history of the files. Note that you stil can access the complete history of the file through command line: `git log --follow ./newflodername/file`
+
+
+[1]: http://www.npgsql.org/  "Official site"
+[2]: https://github.com/npgsql/Npgsql/  "Npgsql source code @ GitHub"
+[3]: http://www.nuget.org/packages/Npgsql/ "Npgsql @ Nuget Gallery"
+[4]: https://github.com/npgsql/Npgsql/wiki/  "Wiki"
+[5]: https://github.com/npgsql/Npgsql/commit/d7beea23f3407b38747cde05568a59ac87cdd121#diff-3b02da674650ba0f31603c365249f34f
+[6]: http://stackoverflow.com/questions/17213046/see-history-in-github-after-folder-rename