Update OpenLayers version

[jboecker]

At the time of writing, we are using OpenLayers 3.0.0-beta.5, while the current version (which has a few backward-incompatible changes) is 3.0.0-gamma.2

I have already forked ndOut/ol3-bower to jboecker/ol3-bower and updated it to v3.0.0-gamma.2.

• The dependency in bower.json needs to be updated:

bower uninstall --save ol3-unofficial
bower install --save git://github.com/jboecker/ol3-bower.git#3.0.0-gamma.2

• The code needs to be updated to reflect changes in ol3 (e.g. View2D -> View, updated version of proj4js)
• Use proj4-1.4.0 from bower_components/proj4 instead of proj4-1.1.0 from vendor_js/