Allow to work with multiple tags

[Yagor]

Since tags seem to be super useful I'm going to implement a better API to use and work with multiple tags.

Current syntax:

map.findMarker({tags: 'myTag'})

AND syntax:

map.findMarker({
tags: ['myTag1', 'myTag2']
})

OR syntax:

map.findMarker([

{tags: {'myTag1'},

{tags: 'myTag2'}
])