Added legal activity.

Contains copyright statement and attributions. Still needs full license text.
Added Apache license.

I don't think we are legally required to present it to the user like this, but let's do it anyway.
Merge branch 'master' into legal

Conflicts:
	src/main/java/com/xebia/xebicon2014/view/MainActivity.java
	src/main/res/menu/main.xml
	src/main/res/values-nl/strings.xml
	src/main/res/values/strings.xml
Added third party software creator names.
Merge pull request #7 from xebia/legal

Legalese