add proper credit for safe_relative_path/1
a little better description of how to use
allow to set action timeout in ssync.app.src
skip deps if deps not changed
use get_deps_dir to have a single point of use of proplists:get_value
fix output to notify-send

handle newlines correctly
rename extension, output to extensions, outputs
allow to run 'rebar doc'
remove debug output
Merge pull request #9 from seletskiy/master

Remove unnecessary debug info