update readme [ci skip]
Add install instructions for Squeak users. Mention all the known-to-work-in Squeak versions.
Merge pull request #144 from frankshearar/squeak-install-instructions

Add install instructions for Squeak users.
Use SystemAnnouncer on Pharo2.
Switch from FileDirectory to FileSystem. fileDirectory is not available on Pharo2.
Switch from FileDirectory to FileSystem. fileDirectory is not available on Pharo2.
Give the "FileDirectory" class for Pharo.
fix baseline for Pharo2.0 (restore OSProcess)
address some FileDirectory refs in MetacelloPlatform>>createRepository:
apparently asReference is deprecated...:
fixed bug in MCGitHubRepository ... BaselineOfMetacello now loads correctly
Remove references to FileDirectory.
add copyToStHub script ... dump using new export code
Refactor metacello to deal with platform specific file system and events managers.
Refactor metacello to deal with platform specific file system and events managers.
Refactor metacello to deal with platform specific file system and events managers.
fix for https://github.com/dalehenrich/builderCI/issues/47
perhaps https://github.com/dalehenrich/builderCI/issues/47 was only a shortterm problem?
Refactor metacello to deal with platform specific file system and events managers.
Refactor metacello to deal with platform specific file system and events managers.