Fix main menu

- move main menu button into header
- change bacgkround of menu
Merge pull request #4 from matodrobec/master

Fix main menu
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This is workaround for update functionality on mongo 2.6.1 where collecion
$unset must not be empty for.
Uprava mongo drivera pre version 2.6.1 (unset nesmie byt prazdny)
Mongodb test empty unset collection
Security schemas
Security role list

Working sample.
Comparison oprators repaired