Merge pull request #8 from alpheios-project/arethusa

support for format, app as agent, fixes to arabic, arethusa test file
Merge branch 'master' of https://github.com/alpheios-project/treebank-editor into arethusa
make sure we look at the SELECTED format before replacing it in the arethusa url and add a hack to override the format selection of smyth if we aren't using greek