Npgsql 2.2.0-rc1

This is the first release candidate (RC) of Npgsql 2.2

This release contains 22 commits since the last release. Includes the following bug fixes:

[#217] Impossible to insert a Double.NaN value
[#179] NpgsqlCommandBuilder automatic sql commands configuration
[#158] NpgsqlCommand.Dispose() should execute "DEALLOCATE " for a prepared command
[#264] Mono.Security is outdated
[#296] parameter parsing fails (regression) and duplicate [#240] NpgSqlCommand does not substitute parameters when there is a string with escaped apostrophe

A complete list of commits for this release can be found here: v2.2.0-beta1...release-2.2.0