Updated to properly exclude files with tar --exclude command
Updated to use map instead of collect
Updated changelog to reflect fixing issue 130
Updated per peer review to simplify logic
Updated to remove files_to_pack since it is no longer needed
Updated to remove files_to_pack functionality in tests
Updated to use '.' instead of '*' so that tar picks up hidden files
Added back multiple excludes in spec
Merge pull request #149 from intuit/issue130

Updated to properly exclude files with tar --exclude command