PLD: add mongo to mac install script
PLD: re-add allow external, install fails (at least) on mac w/o this
PLD: take user as cli arg
PLD: pass user name to install postgis script
PLD: get sav binary from zip file
PLD: rever sav pip changes
Merge pull request #252 from onaio/install-fixes

Install fixes
Merge remote-tracking branch 'origin/master' into api-csv-renderer

* origin/master:
  PLD: rever sav pip changes
  PLD: get sav binary from zip file
  PLD: pass user name to install postgis script
  PLD: take user as cli arg
  PLD: re-add allow external, install fails (at least) on mac w/o this
  PLD: add mongo to mac install script