Add easier tmux binding keys - to split window horizontally and vertically

[ysfdev]

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PR adds adds custom tmux binding keys to split window horizontally and vertically.

Tmux Invocation for horizontal split:

Ctrl + b + - 

Tmux Invocation for vertical split:

Ctrl + b + /

[geoffharcourt]

I use these in my own mappings, but my only hesitation is over making this choice for others.

[rspeicher]

@geoffharcourt Is there something bound to these invocations by default? If not I'd consider it a pretty safe choice, while being much more intuitive than the " and % defaults.

[ysfdev]

Hi @geoffharcourt,

Thanks for taking a look. Based on what @rspeicher has stated above, do you have any other concerns?

[composerinteralia]

I use these in my own mappings, but my only hesitation is over making this choice for others.

For what it is worth, I use these mappings and have seen some other thoughtbot folks using them as well. I am a fan of including them in our dotfiles.