Python SDK V2 Updates 2018-10-11

[jpvajda]

This Update includes:

• X-Org-Id Request Header
• Misc Text Section updates
• GET System FDE Key endpoint
• Misspelling corrections
• Empty description removal
• Standard error additions
• Response body removals
• System FDE key definition
• Standard error additions
• Organization header addition

[jpvajda]

@adducci @thinkterry - could you code review this SDK update PR when you have a moment?