Answer the question: How do I edit specs for a project stored in git?

MetacelloProjectSpecifications.st

'From Pharo1.3 of 16 June 2011 [Latest update: #13315] on 23 February 2012 at 2:38:04 am'!
Object subclass: #MetacelloProjectSpecifications
        instanceVariableNames: ''
        classVariableNames: ''
        poolDictionaries: ''
        category: 'MetacelloProjectSpecifications'! 
 
!MetacelloProjectSpecifications methodsFor: 'Sample.source' stamp: 'dkh 2/23/2012 02:34'!
core: spec
    <project: 'Sample.source' package: 'Core.pkg'>
    spec for: #'common' do: [ spec requires: 'Seaside' with: #('Base' 'Seaside-Email') ]! !

!MetacelloProjectSpecifications methodsFor: 'Sample.source' stamp: 'dkh 2/23/2012 02:34'!
seaside30: spec
    <project: 'Sample.source' projectRef: 'Seaside30.ref'>
    spec
        for: #'common'
        do: [ 
            spec
                version: '3.0.6.3';
                repository: 'github://Seaside/Seaside30/Seaside30.source' ]! !

!MetacelloProjectSpecifications methodsFor: 'Sample.source' stamp: 'dkh 2/23/2012 02:34'!
tests: spec
    <project: 'Sample.source' package: 'Tests.pkg'>
    spec for: #'common' do: [ spec requires: 'Core' ]! !