IDEUI-390 Complete refreshing of Keybindings settings, clean up

Task-Url: https://jira.codenvycorp.com/browse/IDEUI-390
Merge pull request #353 from sunix/IDEUI-390

IDEUI-390 clean up
IDEUI-391 Fixed visibility of right menu actions
IDEX-1689 show a loader if the editor initialization is not finished
Merge pull request #354 from mleduque/IDEX-1689

IDEX-1689 show a loader if the editor initialization is not finished