Update deps

* beefy 2.1.8
* browserify 16.2.2
* typedarray-to-buffer 3.1.5
* xtend 4.0.1

Fix snapshots

use toArrayBuffer() only when present

bump ltgt to 2.1.2 and bump this package to 2.2.3

fix iter when start > end

update to latest idb-wrapper closes #38

readme: update syntax highlighting

Avoid keyword in cursor.continue()

use ltgt module to handle ranges instead of inlining that code.

Do not copy typedarrays when converting to Buffer

The method `continue` shouldn't be called in the bare format, because it's a keyword, so it'll t...

Added .delete function

Removed global leaks

While testing this in LevelGraph I found these two global leaks. You might want to add a JSHint ...

modify a copy of batch operation array, not the original.

Do not throw for approximateSize but pass err to callback instead

remove fn#bind from iterator

Implemented normal batch support.