Log Message:
py-rt: Update to 1.0.12

Changes:
1.0.12
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- Travis CI Docker tests
- RT 4.4 fixes
- Support multiline CF values in create_ticket and edit_ticket.
- Fix support for custom field names containing colons
- In search(), replace splitlines() with lines array split on \n.
- Add debug_mode flag for response logging
- Add platform independent url joining / Allow testing on Windows
- Add numerical_id to get_ticket result