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Fixed removing event listeners in some browsers.

• upgraded to babel@7 (beta)
• exposing flat bundles to npm now

8% gain in lib's size

• Detect passive event support and try to use it only if its available - should fix removing touch event listeners on older mobile browsers

• moved "uid" generation from componentDidMount to the constructor, otherwise if enableOnClickOutside got called before componentDidMount (i.e. in WrappedComponent's componentDidMount) the handler got registered under undefined "uid"

• fixed issue with manual enableOnClickOutside calls - which caused duplicated handlers being attached to the document

• fixed issue with some props being aggressively cached in closures, which caused handlers being called with stale values
• building UMD bundles and publishing them to npm (thanks to @jochenberger)

• exporting IGNORE_CLASS_NAME so it may be used as constant instead of hard-coding it in the projects
• fixed logic of the passive listeners under the hood
• build tools tweaks, distributed files should weigh a little less

• publishing both commonjs and es module format from now on, this allows module-aware bundlers like i.e. rollup and webpack2+ to load this module in a better way

• refactored library to use es6 classes syntax
• allowing for the wrapped component to render null, handling attachment/deattachment of internal DOM listeners automatically in such cases
• passing explicit passive setting for the touch events (based on the preventDefault prop)