restore executable bits in Prepos install

Fixes #2859
Merge pull request #2871 from rolandwalker/prepros_executable

restore executable bits in Prepos install
add uninstall stanza for callnote.rb
Merge pull request #2878 from rolandwalker/callnote_uninstall

add uninstall stanza for callnote.rb
Merge pull request #2626 from rolandwalker/explicit_utf8_encoding

explicit UTF-8 encoding for old Rubies
Merge pull request #2734 from rolandwalker/sort_predictability

make order consistent across Ruby vsns w/sort
make travis test w/ same Ruby we target on desktop

version 1.8.7