Image optimizations for our image resources.

The png files were otimized with 'pngcrush -brute' and the gif with 'gifsicle'.
The changes -- although they are supposed to be lossless -- should be tested in
different browsers.
Fix DOS line endings
Compatibility fix for ExtJS 4.2
Merge pull request #171 from m-click/fix-line-endings

Fix DOS line endings
Replaced native indexOf() with Ext.Array.indexOf()

Replaced native indexOf() method with Ext.Array.indexOf() to gain compatability with IE8.
Merge pull request #172 from buehner/patch-1

Replaced native indexOf() with Ext.Array.indexOf()
Merge pull request #170 from m-click/fix-extjs-4.2

Compatibility fix for ExtJS 4.2
Merge pull request #152 from marcjansen/pngcrush

Image optimizations for our image resources.
Use Ext.Array.indexOf not Array.prototype.indexOf.

This is especially important for e.g. IE 8, where the native array does
not have the indexOf method.
Merge pull request #174 from marcjansen/index-of

Use Ext.Array.indexOf not Array.prototype.indexOf.
Use a different print-servlet URL in examples.
Merge pull request #175 from marcjansen/print-examples

Use a different print-servlet URL in examples.
Make all tests pass again.

This includes three fixes:

* Round when compairing center coordinates (`panel.PrintMap` test)
* call `panel.PrintMap.bind` in `afterlayout` event
* Do not destroy `map` which is already destroyed when tearing down
  tests (`data.LayerStore` test)

The tests now all pass in Chrome 21 and Firefox 20 (both on a linux box)
and also in Internet Explorer 8 (Windows XP).
Merge pull request #176 from marcjansen/test-fixes

Make all tests pass again.
Call parentRenderer with correct context
Merge pull request #179 from sweco-sebhar/ext411a-fix

Call parentRenderer with correct context (r=@bartvde)
Remove global variable leakage.
Merge pull request #181 from marcjansen/global

Remove global variable leakage. (no formal review)
Prevent unchecking of radio button in tree
Upgrade loader to point to Ext 4.2.1