Add PostgreSQL RDBMS support

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