use obo-label-names in sentences as well

This is solved by just calling set_display_text! on the
sentences at the right time (after the display_name for
the symbol has been updated).
add migration to update display_text of obo

Add the migration the update the display_text
of already existing obo sentences.
set displaytext in sentence only if non-nil.
optimize set_display_text! body.
improve conciseness of the obo-text migration.
use start_cluster rake task for elastic test

This will allow for a longer bootup-time before
a timeout.
add a script to rebuild ontohub in development.
add invoker-support to rebuild script

This includes aborting if invoker ist not installed and
restarting a running invoker instance, or starting a new
one if no one was running before.
set ontologies correctly for global/local.
extract search-response display into own partial.
display default ontologies inside of repository.
move ontology-search partial to ontologies

Actually the partial is not shared between controllers. Only the
OntologiesController uses it.
let search controller use partial in ontologies.
Merge pull request #1129 from ontohub/fix-ease_of_use

Fix ease of use
Merge pull request #1130 from ontohub/display_ontologies_inside_of_repository

Display ontologies inside of repository
use method syntax for blocks where possible.
Merge pull request #1123 from ontohub/1099-label_symbols_in_obo_sentences

1099 label symbols in obo sentences
add backup script
rename module to Backup
add helper method for maintenance file path