Expose commands to control RecentFilesView selection

[forceuser]

This pull request exposes selectNextItemView() and confirmSelection() of RecentFilesView commands to control RecentFilesView selection, to make this package more configurable
For example i want to configure switching between recent files with just one key shortcut (ctrl-tab, like in NetBeans), this is keymap.cson example for this configuration

'atom-workspace':
  'ctrl-tab': 'recent-files-fuzzy-finder:toggle-finder'
  'ctrl-tab ^ctrl': 'unset!'
'.recent-files-fuzzy-finder':
  'ctrl-tab': 'recent-files-fuzzy-finder:select-next-item'
  'ctrl-escape': 'recent-files-fuzzy-finder:toggle-finder'
  '^ctrl': 'recent-files-fuzzy-finder:confirm-selection'

I have also added .recent-files-fuzzy-finder class to the RecentFilesView, to manage keymaps only for it

[viddo]

Nice one! 👌

I've noticed that the coffeelinter and an (unrelated) test case also fails on master, so I'll go ahead and merge this and fix those things separately. I'll do the release ASAP I have that sorted out.

Thanks! 🙇

[viddo]

FYI: https://github.com/viddo/recent-files-fuzzy-finder/pull/19/files#diff-04c6e90faac2675aa89e2176d2eec7d8R29

Let me know if something looks wrong. Otherwise I'll merge and release this once Travis goes green (probably sometime tomorrow morning).