Merge pull request #105 from demarey/pharo3.0

Workaround for the following bug: https://pharo.fogbugz.com/default.asp?... code looks good
remove Git load/testing for pharo3.0, per Thierry's comment[1]

[1] https://github.com/dalehenrich/filetree/pull/103#issuecomment-23566456
have to remove MonticelloFileTree-GitTests from Tests ... create separate Git Tests group
bump baseline monticello version