Add ctrl-n,p emacs bindings for next, previous

Emacs binds are supported through most of the rest of Atom. Plus it's rough having to drop down to the arrow keys in the midst of typing :)
fix logic error
Merge branch 'patch-2' of https://github.com/yongkangchen/autocomplete-plus into yongkangchen-patch-2
Merge pull request #81 from brendankemp/master

Add ctrl-n,p emacs bindings for next, previous
:bug: Fix autocompletion with multiple selections

Fix saschagehlich/autocomplete-plus#57
:green_heart: Fix broken positioning tests

Despite setting the height in lines of the editor view, its
`outerHeight` always returned 0.
Merge pull request #101 from abe33/feature/multiple-selections-support

Feature multiple selections support
Merge branch 'master' into feature/async-provider-suggestion-api