issue-31 fix

[llbaker302]

issue 31 fixes:

• vtt files seem to start with \ufeffWEBVTT so updated on line 69
• removed line 83 as was causing the .srt to be unreadable

[isaacbernat]

@kewickviper thanks for the fixes. I added to the PR:

• a new sample from your input so it can be tested again.
• a fix for python2 (since it's still the default in many systems).

Could you check it works for you so I can merge it to master? Thanks!

[llbaker302]

Tested on the same batch, works perfectly for me.