remove installation guide from README

the guide which was in the README was to big
moved the missing parts into the wiki and
remove the text
add create_version method
add create_ontology method

Conflicts:
	app/models/repository/git_repositories.rb
remove iri argument
simplify ontology retrieval
make user argument mandatory
rename variable
add do_not_parse to save_file
fix version having wrong path bug
move tests to rspec
further simplification
set ontology_id of translated sentence correctly

The ontology_id of translated sentence should
equal the ontology_id of the underlying sentence
and not the origin of the mapping.

This is because there could be multiple mappings
without a sentence-definition in between.
add migration to reset translated ontology_id

For TranslatedSentences the ontology_id should refer
to the origin sentences ontology_id (it should
basically be a shortcut).

The migration will take care of that. However
there is no reversal for this particular migration
as the erroneous data is 'lost'.
rename method remote? to mirror?
Merge pull request #979 from ontohub/963-rename_remote_to_mirror

rename method remote? to mirror?
Merge pull request #976 from ontohub/936-readjust_origin_of_sentences

936 readjust origin of sentences
updated general information about ontohub
handle non-existence during timeout

If an ontology version can't be found it probably does not exist, so we
can't timeout on it.
declare queues for workers explicitly.
let god start sequential worker(s).