WSOTWO-127: added a button for changing property panel visibility
Merge branch 'master' into UI

Conflicts:
	codenvy-ext-wso2-core/src/main/java/com/codenvy/ide/ext/wso2/client/LocalizationConstant.java
	codenvy-ext-wso2-core/src/main/java/com/codenvy/ide/ext/wso2/client/editor/ESBConfEditor.java
	codenvy-ext-wso2-core/src/main/java/com/codenvy/ide/ext/wso2/client/editor/ESBConfEditorView.java
	codenvy-ext-wso2-core/src/main/java/com/codenvy/ide/ext/wso2/client/editor/ESBConfEditorViewImpl.java
	codenvy-ext-wso2-core/src/main/java/com/codenvy/ide/ext/wso2/client/editor/graphical/GraphicEditor.java
	codenvy-ext-wso2-core/src/main/resources/com/codenvy/ide/ext/wso2/client/LocalizationConstant.properties
	codenvy-ext-wso2-editor/src/main/java/com/codenvy/ide/client/editor/WSO2Editor.java
	codenvy-ext-wso2-editor/src/main/java/com/codenvy/ide/client/editor/WSO2EditorViewImpl.java
WSOTWO-125: merged with master
WSOTWO-138: Added dotted background for root element
WSOTWO-127: added new style for the property panel
WSOTWO-94: improved look and style editor's buttons which change workspace view
WSOTWO-94: fixed problem related to workspace resize
WSOTWO-138: Adopted general mediator style
WSOTWO-138: Resized icons
WSOTWO-138: Adopted branch widget to new design
WSOTWO-94: improved css styles of editor
WSOTWO-138: Added an ability to select no element when one clicked in empty place on toolbar or properties panel
Merge branch 'UI'
WSOTWO-94: fixed bugs related to properties panel displaying
Merge remote-tracking branch 'origin/master'