IE debugger fixes

[prashn64]

Fixes two issues:

1. IE8 and below throws an error when calling indexOf on an array, so make a dust shim for it ( dust-core.js errors in IE8 #418 )
2. IE9 and below treats console.log as an object as an object instead of a function, so add a check for that, and if it's an object, call it directly

This is patching back to 2.1.x so please double check the commit history.

[kate2753]

Code changes look good. Makes sense to redefine dust.log after first call so we don't do "if not IE \ else" logic with every log.

Parent commits for 2.1.x, 2.2.x and 2.3.x look good as well.

[kyletsang]

I believe there's an error in the indexInArray function.

for (;fromIndex < length; fromIndex++) {
      if (this[fromIndex] === item) {
        return fromIndex;
      }
    }

Shouldn't this[fromIndex] be arr[fromIndex]? See code below:

for (;fromIndex < length; fromIndex++) {
      if (arr[fromIndex] === item) {
        return fromIndex;
      }
    }