Issue #750: fixed NoMethodError accessing node["monitoring"]["configs"]

- NoMethodError: undefined method `[]' for nil:NilClass recipes/default.rb:100
- http://stackoverflow.com/questions/19290710/ruby-syntax-in-chef-recipe

(cherry picked from commit 79e11e2e23f218af5570bef32d2d93769414f73c)
rcbops/chef-cookbooks#751: fixed issue when path attribute was changed

- when attribute node['collectd']['collectd_web']['path'] was changed
  between two Chef runs, the tarball wasn't extracted into the new path

(cherry picked from commit dccf5300ff516abbef05772d32b99cffd51d41f2)
Merge pull request #33 from claco/fix-no-method-error

Merged automatically by jenkins after successful build test
Merge pull request #35 from claco/fix-path-action

Merged automatically by jenkins after successful build test