moving to elasticsearch
added elasticsearch to .travis.yml
updated spec_helper
updated index definitions
added dummy migration files
CSV -> TSV next-l/enju_leaf#155
added link to export
fixed Gemfile
do not import users that have higher roles than current user's role
set default role
updated spec file
use statesman for UserImportFile

Conflicts:
	app/models/user_import_file.rb
	examples/user_import_file_sample.tsv
	spec/dummy/db/schema.rb
	spec/models/user_import_file_spec.rb
added statesman initializer
moved modules from enju_seed
removed plugins directory
fixed loading modules
Merge branch 'elasticsearch'