Cleaner way enable dry run and to increase verbosity

dryRun and verbose configuration options were strings, they are now integers.
0 disables the corresponding features and 1 enables it.
For "verbose", higher values (eg. 3) increases the verbosity level.
Fixes a quote issue in rsync command

Removes unnecessary quotes around the final rsync command.
Theses quotes caused issues because of invisible spaces that made rsync push the
current working directory to destination.