Create additional Powerline glyphs

[saucep]

Fantastic project, and really grateful for all that's been accomplished so far.

I use Powerline inside of tmux, and while the E0B0 and E0B2 glyphs work perfectly for most prompts, tmux also includes the "soft" divider glyphs E0B1 and E0B3. If these could be added, that would be amazing.

I tried to achieve this using the (also great) Nerd Fonts project, but found a peculiar side effect of the overall spacing between characters increasing, plus I'd rather not patch the fonts twice if possible.

[kiliman]

Thanks for the kind words. Someone requested other glyphs as well #144.

When I get from free time, I'll try to tackle these and get the rest of the Powerline glyphs added.