nunaliit2-js: Refactor n2.couchAuth so that service is an instance of a
class, not a global set of functions. Add login widget to eliminate code
duplication. Globalize n2.couchAuth.

nunaliit2-couch-application: Change all the tool pages to re-use login
widget, instead of duplicating the code.

Issue #49
nunaliit-couch-application: Improve translation tool with output for
generating static translation files. Add schema for translation
requests. Modifiy l10n views to be more compact. Add reduce function to
l10n-translated to query available languages.

nunaliit-js: Add nunaliit_schema property to translation requests.

Issue #49
Fix problem converting video on Ubuntu 12.04, where FFMpeg/Medibuntu no
longer supports audio codec libfaac. Instead, use libvo_aacenc