IDEUI-390 Complete refreshing of Keybindings settings . Fixing bug: if
no keymap preferences have been persisted yet, it won't refresh properly 

Task-Url: https://jira.codenvycorp.com/browse/IDEUI-390
Merge pull request #357 from sunix/IDEUI-390

IDEUI-390 Complete refreshing of Keybindings settings . Fixing bug: if