First try of reimplementing the gridtree visualizer as vaadin component. Still
missing:
	- colored matchings
	- mark the base level when hovering nodes
	- tooltip should display the namespace of the node, not the depth of the
	  tree
	- island feature which, should be solved generic in AnnotationGrid.
Mark matching nodes in grid tree
The tok row is labeled as tok. This reformats the tok row automagically.
Highlighting base row by hovering the nodes works in gridtree again.
Indexshift is made by AnnotationGrid not by GridTreeVisualization.
Add tooltip to gridevent for having more controll about the tooltips. Gridtree
could not use the row caption for tooltips, but the namespace + annotation key
for every GridEvent.
Restrict the graph traversal to nodes with annoations of the triggering
namespace.
Make the Annotation token line configurable. There is now an additional
constructor for defining the token row, which is used. If no explicit token row
index is set "tok" is assumed.
 not return a all example queries when the corpus id list is empty.

    fixes #198
Add annis/meta url to shiro.ini to allow anonymous access to the meta interface
Introduce a new permission resource for the meta data REST interface. This
simply means that there are no "query" prefixes before the "meta" resource.
upgrading vaadin to 7.1.3
Revert "upgrading vaadin to 7.1.3"

This reverts commit 1a4e837a3b4e59a072d33072e6a956298ab76b63.
Remove the old, iframe based gridtree visualizer.
Reimplementation of the gridtree visualizer. It is now based on vaadin
components and supports spans as token row.

fixes #168

Merge branch 'rewrite-gridtree' into develop
upgrading to vaadin 7.1.3 and removing some of the "VaadinSession.getCurrent().lock()" idioms
refactoring the search result panel
ExecutorService is not serializable
Revert "refactoring the search result panel"

This reverts commit e70f6306afe57120a54c72fee4c74163c745aae2.
making the query threading process more easy (layouting does not work yet as expected)