eliminate BSD grep discrepancies
Merge pull request #63 from mlloreda/grep_fix

eliminate BSD grep discrepancies
cleaned up `settags()`.
used local vars and improved code readability.
Merge pull request #64 from mlloreda/scope_cleanup

cleaned up `settags()`.
remove OS X instruction from README
Merge pull request #66 from mlloreda/patch-2

remove OS X instruction from README
Merge pull request #69 from lukapusic/master

merge