Removes a reference to an explicit version number in the Admin guide.
Fixes the automatic version setting to use grep instead of maven in the Sphinx build file, conf.py.
Update for release 2.5.1
Replace all numbered version references.
Add references to version and a substitution to the current version number.
Have the checked in license rst files show the version they were generated from, and the html show the current version.
Change the licenses.py to generate the rst files in that manner, with an orphan directive.
Return to hard-coded numbers.
Merge branch 'release/2.5.0' into feature/r2.5.1_renumbering
Merge pull request #514 from caskdata/feature/r2.5.1_renumbering

Feature/r2.5.1 renumbering