add ComputedAttribute to allow support for computed columns on Insert

Fixed broken link

Async cleanup; implement missing async methods based on multiple pull requests, but introducing CommandDefinition to preserve binary compatibility while allowing new options

Dapper.Contrib - Fix broken properties cache.

Fix double?/decimal? conversions (with test); added (currently failing; acknowledges current state) test re missing members

Signed-off-by: Marc Gravell <marc.gravell@gmail.com>

- huge thanks to bkaid

Added support for TVP in anonymous objects

DapperRow dynamic invocation fails in Visual basic - fix

Implement connection-string equivalence (similar to https://github.com/SamSaffron/dapper-dot-net/pull/80)

Fix Issue131

@david.obando

Rainbow: Ignore Id property when calling Table.Insert 

Updated Table methods to better support multi-DB

"Id" is being removed most places in Rainbow, but not on Table.Insert. I
changed this to make it consistent with SqlCompactTable.Insert and
Table.Update.

Fixed DapperTable issue

Added database schema support to Dapper.Rainbow

Bug fix for "Invalid attempt to call MetaData when reader is closed"

Added possibility to add custom type maps - enables serialization of enums to DbType.String instead of DbType.Int32