Backport scc version prefix support to omego

- Add support for vX.Y.Z prefixed tag
- Add pip install step to Travis build
Merge pull request #29 from sbesson/version_prefix

Backport scc version prefix support to omego
Added DbParser for command line args

DB arguments may be common to both db and server admin commands
First attempt at some database administration commands
DbAdmin now takes init/upgrade as a command

Also fixed the sorting of SQL versions in the new server
Automatically attempt to upgrade DB in omego upgrade

New flag added, --upgradedb, defaults to false