Fixes table storage support for binary data, empty strings/strings with spaces and clarifies behavior for None (Azure considers None/null properties the same as missing properties)

#140 Table Service deletes empty strings
#40  Edm.Binary and null support in table storage entities
Merge branch 'tableemptystring' of https://github.com/huguesv/azure-sdk-for-python into huguesv-tableemptystring

Conflicts:
	ChangeLog.txt