added tags and languages api view for snippet package
add unit tests for tags api view
edit typo
add unit tests for languages api view
accidentally added codes remove
edit account tests
added serializers for snippet package
token auth bug fix
added snippet create, update, delete for snippet package
edit snippet star
token auth. bugfix
added tag snippets list and language snipepts list for snippet package
change url design
edit typo
create snippet bugfix
serializer tests bugfix
edit tests, django_nose integration, edit urls
added another tests
added snippet starred users list view
 repeated codes removed and automate unit tests