esl-9067 Added API response codes and messages
esl-8928, esl-8930 Added support for delete/update sender from account
esl-9090. Added support for enabling/disabling logging of json sent to backend
Merge branch 'dev' of github.com:silanis/esl.sdk.net into dev

Conflicts:
	sdk/Silanis.ESL.SDK/Silanis.ESL.SDK.csproj
	sdk/Silanis.ESL.SDK/src/RestClient.cs
	sdk/Silanis.ESL.SDK/src/Services/PackageService.cs
esl-9090. Fix csproj file from merge conflict
esl-9090. Remove Properties/app.config in csproj file
esl-8929, esl-8931 Added support for delete/update sender from account
esl-9067 Provides API response code and message through EslServerException
Merge branch 'master' into dev
esl-9282. Cleanup and move converter code to separate classes
Added a sample illustrating exception handling.
esl-9332. Add support for getting callbacks
Merge branch 'dev' of github.com:silanis/esl.sdk.net into dev
esl-9334. Added support for deleting account custom fields
esl-9343 Delete Signature/Approval
esl-8076 Added support for one-step package creation
esl-9346. Added support to download original document pdf
esl-8076 Added support to upload packages in one call
esl-9343 Added support to delete signature from document
esl-9337. Added support to get document's metadata