Add a mappanel test originally from #61.

The test form @lellmer is ported over, the fix introduced in that particular
pull request is no longer needed.
Enable travis.
Add build status to README.md
Merge pull request #215 from chrismayer/master

Be more cautious when testing for OpenLayers
Merge pull request #216 from marcjansen/travis

Enable travis. (r=@bartvde)
Smaller formatting changes to README.md
Better formatting and headless testing.
Minors

We use OpenLayers 2.13.1
Use Ext.create instead of new for Ext classes
Merge pull request #219 from sweco-sebhar/treeLegendExtCreate

Use Ext.create instead of new for Ext classes
Modularize and enhance the headless test script.

This refactors the test-script `run-testsuite`, so it isn't one big file,
but uses two newly created modules: `strUtil` and `tawWrapper`.

* `strUtil` exports methods for padding strings.
* `tawWrapper` exports methods for finding test-files, plus finding and
  executing Test.Anotherway functions.

Also included in this commit is a more robust way of detecting the base path
of the testsuite. This script should now be callable from everywhere, not only
from the root of the repository.
Use different print-servlet in examples.
Merge pull request #222 from marcjansen/printurl

Use different print-servlet in examples.
Only allow submission when form is valid.

If the `comment` field is empty, the print-servlet complains with a
nasty and long textual error message.
Add a vector layer to printpreview example.
Disable tileManager for maps in PrintMap panels.

Also set the same defaults for new maps as in the Map panel.
When cloning: no need for special handling.

Previously Vector layers wouldn't be cloned, but recreated from scratch
and would e.g. loose styling from StyleMaps. See #217.
Whitespace cleanup.
Fix the README part about headless testing

After we merge #220, the script can be called from mostly anywhere, currently only from the root of the repository.
Merge pull request #223 from marcjansen/printform-example

This is a simple and nice fix. Tested and approved to be working fine.
Will merge this one...