Isolated instance of tcomb

[StreetStrider]

As for now, tcomb exports stateful instance, so library users will collide at least in tcomb.fail, and if they will extend tcomb with refinements, there's a chance refinements will collide too. It would be great to implement noConflict mode for tcomb:

import Tcomb from 'tcomb/create'
var tcomb = Tcomb(/* possible options here */)
tcomb.fail = () => … /* override `fail` without collisions with other library authors */
export default tcomb

then use later local stateful tcomb.
Library authors will use new import … from 'tcomb/create' to instantiate their own no-conflict instance of tcomb, while app authors may still import tcomb from 'tcomb'.