switch from faux-concat to actual-concat
fixed auto chmod of incoming and outgoing files

* added test and documentation
* Converted specs for chmod incoming and outgoing
  should_not to is_expected.not_to
Merge pull request #41 from chrigl/fix-auto-chmod

fixed auto chmod of incoming and outgoing files
Merge pull request #43 from 3dna/concat-ify

switch from faux-concat to actual-concat