Fixed this error

No refs in common and none specified; doing nothing.
Perhaps you should specify a branch such as 'master'.
fatal: The remote end hung up unexpectedly
error: failed to push some refs to 'git@github.com:collective/collective.logbook.git'
Push all branches and tags
Update old-svn.rst
indentation fix
indentation fix
Minor clarification and typo fixes to new repo instructions