clean redis-db namespace before each spec.
improve redis cleaning rake task method

Instead of calling delete for each key, we call
delete for all keys at once.
Badge format changed to SVG
use coffeescript instead of js for codemirror
add file edit spec
fix file edit according to spec
Merge pull request #809 from ontohub/fix_redis_cleaning_in_tests

Fix redis cleaning in tests
disable write permission for remote repositories
fix upload ontology link
make commits list more compact
put ontology file extensions to database
rename seed files for more space in between
add functions for retrieving extensions from db
fix failing tests by stubbing ontology extensions
Merge branch '813-tests_file_edit' into develop
Merge branch '582-disable_editing_on_mirrors' into develop
Merge branch '300-compact_history_view' into develop
Merge branch '330-file_extensions_in_database' into develop