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Add a VERSION file and fix the RB Gateway docs name.
Review Request #10065 — Created July 3, 2018 and submitted
This introduces a VERSION file that will be used for the RB Gateway
documentation and packaging process. It simply contains the version in a
standard format parsable by Python and beanbag-tools (allowing for
versions like "2.0beta1").It also fixes the RB Gateway documentation to not have "documentation"
appear twice in the generated name.
Built the docs and checked the resulting version and doc names.
