= all: New version 2.0

Merge pull request #84 from 47deg/=all-upgrade-for-sonatype-version

Prepares for Sonatype releases

! all: Replace AppContext and ActivityContext with ContextWrapper

This implementation is more flexible (for example, it supports
widget creation in Services) and requires less boilerplate.
The WeakReference mechanism is still in place. See discussion in #54.

= all: Add publishing settings

! core: Move util.Ui to Ui

= Improve implicitNotFound annotations

= Update all dependencies, publish for Scala 2.11

= Update build, fix a couple of bugs

! Use Ui in Tweaks.addViews, remove Tweaks.addViewsReverse

= Update to paradise-M6, improve quasiquote hygiene