fix issue #242
Add a .gitattributes file to avoid merge pbs with metadata.
Merge remote-tracking branch 'dale/master'
Adds MetacelloPlatform>>tempFileFor:suffix:
Removes MetacelloPharo30Platform>>tempFileFor:suffix:
Merge remote-tracking branch 'dale/master'
Merge pull request #256 from demarey/master

fix issue #242
Merge branch 'master' into dev
Issue #261: proposed bugfix (replace lookupSpec: call with projectSpec call) and test case
Merge branch 'issue_261' into dev
Issue #262: remove squeak trunk from lineup until issue is resoved