config for arabic
Make some specific hardcoded changes for arabic
Use remote server for treebank document
Add docIdentifier to arabic configuration
Start to work on directive to handle language specific changes
Set lang attribute with lang-specfic attribute
Set the dir attribute with lang-specific attribute
Replace hard coded lang and dir attribute with lang-specific
Add invertOrder config to dagre-d3
Remove debug output from dagre
Remove unused scope so to prevent multiple scope error
  Extract LanguageSettings service from lang-specific
Use languageSettings to set tree order
On languageSettings.getFor none existing doc return undefined
Treat tree order like other tree layout properties
Add specs for languageSettings
Update lang-specific specs to stub languageSettings
Rename invertOrder to sortRankByIdAscending
Add amiri fonts
Set font-family to Amiri for Arabic.