add ThetaStar

[mm304321141]

add Theta* Algorithm .

[imor]

@mm304321141 Could you please fix the failing Travis CI.
Another minor point is that the starting brace on if or else conditions should have a space between them. Like this:

if (blah) {
...

Not:

if (blah){
...

[mm304321141]

fixed & formated

[jefersonbelmiro]

Why this pr has not yet been merged?

[godknowsiamgood]

@qiao @imor Is there are anything that stops this merge?

[Ascendzor]

Bump!

This will be a great feature to merge @qiao

It would be the only any-angle pathfinding algorithm in this library.

[DakotaLarson]

@qiao Can I ask why this hasn't been merged? This library is fantastic and I am personally looking for a Theta* implementation. Guessing others are as well.

[framp]

There are no significant changes in this repo since 2015 anyway, you can just use mm304321141's fork like so:
npm install git://github.com/mm304321141/PathFinding.js.git#master