remove some version of libraries

Remove old libraries versions and leave only the latest patch version
for each minor version.
Removed:
- backbone 1.1.1, 1.1.0
- marionette: 1.6.2, 1.7.3, 1.7.0
- backbone.associations: 0.5.1, 0.5.4
- backbone.mutators: 0.4.1
- backbone.pageable: 1.4.5
- backbone.virtualcollection: 0.4.14, 0.4.12, 0.4.11, 0.4.8, 0.4.5
update marionette to 1.8.3
update backbone.stickit to 0.8.0
bump to 0.6.0