Ignore temporary files

thumbs.db, temporary Excel files
MID Innovator test results
Update from MIWG repo
Delete local changes
Merge https://github.com/bpmn-miwg/bpmn-miwg-test-suite
Merge pull request #3 from bpmn-miwg/master

Updates in bpmn-miwg
Merge Pull request #9 from bpmn-miwg
Merge pull request #9 from bpmn-miwg/master

Update from BPMN MIWG
Roundtrip redone; Results wording consistent with other tests.
Conducted test B.1.0 for MID Innovator
Analyzed test results for B.1.0 / MID Innovator.
Fixed minor merge issue.
Moved the checklist to a more prominent place
Merge pull request #13 from mskurz/master

MID Innovator: B.1.0 import+export test + updated A.1.0 roundtrip