remove some comments and such
FS.Collection.insert should return the `FS.File` object
Refactor and documentation

* Adapt `dataTransfer` to jQuery `originalEvent`
* Documentation of methods
* Refactor and split code into smaller reusable functions
* Added `acceptUploadFrom`
init api docs
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Small headline
Add support for `Join`
update docs
Add docs and `FS.File.fetch`
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docs + insert callback returns `FS.File` instead of `id`