Don't use isFile/isFolder/isModule methods. It's introduces ambiguity.
IDEX-1467 turn on code assistant tests
Merge remote-tracking branch 'origin/master'
Merge branch 'master' into IDEX-955

Conflicts:
	codenvy-ext-java/src/main/java/com/codenvy/ide/ext/java/client/projecttree/JavaFolderNode.java
	codenvy-ext-maven/src/main/java/com/codenvy/ide/extension/maven/client/projecttree/MavenProjectNode.java
IDEX-955: refactorings