Updated IndirectTransmissionMonitor to use workspaces

Refs #10057
Improved documentation and unit test

Refs #10057
Update README.md
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Update buildscript
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Merge remote-tracking branch 'origin/master' into test/test_branch
Update README.md
Merge pull request #34 from mantidproject/feature/10119_mantid_dev_spec

Consolidate the mantid developer spec files