Excel Data Reader - Read Excel files in .NET

1) Fix issue on binary reader: when opening uncalculated workbooks the method AsDataSet returns 0 tables.
2) Unit tests with missing files were removed.

Added missing excelreaderclass

Updated Silverlight excel reader. XLSX reading now works as using dummy filesystem and memory streams to store the extracted xlsx files rather than attempting to write to local disk (forbidden). Still problems with the binary xls reader, many due to not being allowed to use default encoding in SL. XLSX reading works much better (all tests and new tests pass)

Incorporated most patches available up to now.
Still a few problems with dates on the binary reader, but these were present in last checked in version (some because expecting US date format and I'm working on UK date format).
Xlsx reader working much better now, new tests added

-Fixed a couple date-related interpretation errors
-Modified the interfaces a bit

First commit of the Silverlight port.
Notes:
-System.Data is not available for Silverlight runtime, so replaced with interfaces for generic data classes
--Example data classes provided, but just a skeleton. Implementors will want to roll their own.
-Non-Unicode encodings are not available in Silverlight, so Encoding.Default was changed to Encoding.UTF8
-Replaced Zip library with its Silverlight port
-Removed incomplete/unused files for this port
-Refactored quite a bit of code because I'm compulsive.
-Included Silverlight builds for NUnit and sample Excel files for tests to demonstrate reading works
-Silverlight reference assemblies are not included
--To builder, Silverlight SDK (maybe just runtime?) needs to be downloaded from Microsoft
--Reference paths may need to be fixed

v.2.0.1.0

V2

- Factory
- OpenXml File
- Tests

V2

- Factory
- OpenXml File
- Tests

V2

- Factory
- OpenXml File
- Tests

V2

- Factory
- OpenXml File
- Tests

V2

- Factory
- OpenXml File
- Tests