added Higgins (RP) minimal pairs counts from
  http://myweb.tiscali.co.uk/wordscape/wordlist/minimal.html
Note: in higgins_reduced.txt the labels have been changed to
match the (American English)
Hillenbrand labels, including the removal of several r-coloured
phones that are absent in r-ful dialects (the "vowel" in 'bear'
for example); but there are still some discrepancies (most notably
[ɑ] has been removed by dint of being largely "ar", but is not only
"ar", and the list for [ɒ] has been used for the "cot" vowel)
Furthermore, there are such obvious dialectal discrepancies as
[ɛt], "ate", which was counted in various minimal pairs.
Merge branch 'master' of github.com:SnippyHolloW/speech_embeddings