Fix newline handling at the end of fragments

[LadyNamedLaura]

$ matches both end of string and end of line.
so /\n$/ matches \n\n anywhere in the string.
while /\n\Z/ only matches \n at the end of the string.

irb(main):021:0> "a\n\nb" =~ /\n$/
=> 1
irb(main):022:0> "a\n\nb" =~ /\n\Z/
=> nil
irb(main):023:0> "a\n\nb\n" =~ /\n$/
=> 1
irb(main):024:0> "a\n\nb\n" =~ /\n\Z/
=> 4

[LadyNamedLaura]

the one failed travis job failed on bundle exec rake 'litmus:install_agent[puppet6]' which I don't think this code is involved in.

[DavidS]

Looks good to me.

I've rekicked the centos6 tests. the repo is sometimes a bit temperamental.