ENH #86 let user pick path for RE_md

[rodolakis]

• close #86

[coveralls]

Pull Request Test Coverage Report for Build 4545529685

• 6 of 7 (85.71%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 80.094%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
bluesky/instrument/framework/initialize.py	6	7	85.71%
<!--	Total:	6	7	85.71%	-->

Files with Coverage Reduction	New Missed Lines	%
bluesky/instrument/devices/temperature_signal.py	1	93.22%
<!--	Total:	1		-->

Totals
Change from base Build 4521891276:	-0.1%
Covered Lines:	849
Relevant Lines:	1060

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💛 - Coveralls

[prjemian]

Looks good. I want to test this locally before merge.