Move Collaboration of Core Team to gitter chat

[lavriv92]

reasons: We will join to github and waffle board from chat and all members can review

[alexchmykhalo]

+1 from me (but see my comments)

pros:

• integration of all Org process around single repo and mail notifications about unread messages
• public visibility - so all org decisions will be open for community

cons:

• Skype is always primary tool for chatting (for gitter you should open web page or install an app mobile\desktop)
• Current communication \ discussion style should be improved - to not move disagreement\conflicts to public

[alexchmykhalo]

All other Core Team members should vote - it need to be convenient for everyone

[alexchmykhalo]

@vshevchyk @TeslyukTaras @neaptolem Any thoughts on that?