Creating remote db backup on db:up; keeping up to :keep_releases backups

See evolution/generator-evolve#1
Merge branch 'master' into 1-db-backup-keep-releases

Conflicts:
	lib/capistrano/tasks/db.rake
Added test for db backups
Update deps
Improve domain error message
When in --dev, use 'master' instead of current version
Merge pull request #3 from evolution/1-db-backup-keep-releases

Backup remote db on db:up, keeping up to N backups
Evolution version is dev ? master : this.pkg.version
Clean up postInstall
Remove symlink before creating it
Roles are part of the generator now
Fix evolution version
Bump to v1.0.1
Fix mock roles
Correct README version
Add prompt for SSL/private
Fix pkg.version again
Add private to bower.json
Whitespace cleanup
Bump to v1.0.2