Issue #281:

backport fixes from PR #257, Issue #227 and Issue #226
Pharo3.0 not supported at this point [ci skip]
fix typos in metacello's user guide
Merge pull request #282 from vonbecmann/patch-1

fix typos in metacello's user guide
Merge pull request #285 from dalehenrich/dev

collected bugfixes to coincide with MetacelloPreview 1.0.0-beta.32.15 release
Merge branch 'issue_281'

Conflicts:
	.travis.yml
	repository/BaselineOfMetacello.package/BaselineOfMetacello.class/instance/baseline..st