v0.8.1 Bug fix release

• Debugger appeared right after installing the Git Browser. #288
• Display server error message when a push failed. #264
• Various bug fixes when the repository did not contain any commits yet. (Among others, #204)
• If a new packages was added to a Tonel repository, it was serialized in FileTree format. #278
• Tonel repositories were not detected as such by Metacello. Write the IceBerg properties file to nudge Metacello. #277
• Errors when a repository didn't have a table of contents file yet and one was to be created when at the same time packages were added or removed.
• Class trait changes were grouped wrong in the changes chooser. #280
• Hide an implementation detail in the changes chooser after having upgraded from older versions of Squot. #259
• Prevent invalid names of new remotes. #248
• Select a branch that was just created.