Change GetCollection to return IQuery

This looks like it got missed in the big update.
Add support for Table Storage Merge operations
Merge pull request #53 from mmcgill/MergeSupport

Add support for Table Storage Merge operations
Creating 4.0.0 release
Fix MemoryTableContext rowkey comparison

MemoryTableContext.GetRangeByRowKey was not performing ordinal string
comparisons, leading to incorrect results.
Merge pull request #56 from mmcgill/FixGetRangeByRowKey

Fix MemoryTableContext rowkey comparison
Creating 4.1 release