Removed outdated releases

Just to cleanup the old stuff i have created the tag
https://github.com/crowbar/crowbar/tree/backup/releases-before-2014/releases
to preserve the old releases but i removed the following releases
directories for now:

* betty
* elefante
* essex-hack
* feature
* fledermaus
* hadoop-1.0
* mesa-1.6.1
* mesa-1.6
* mesa-1.7
* rails3anddb
* v1.2-openstack-dell
* v1.2-openstack
* v1.2-rc2-openstack
* v1.2
* v1.3-openstack-dell
* v1.3-openstack
* v1.4-crowbar
* v1.5-openstack-dell
* v1.5-openstack
* v1.5.1-openstack-dell
* v1.5.1-openstack
* v2.0-hadoop-dell
* v2.0-hadoop
* v2.1-hadoop-dell
* v2.1-hadoop
* v2.1.1-hadoop-dell
* v2.2.0-hadoop-dell
* v2.2.0-hadoop
Merge pull request #2046 from tboerger/feature/release-cleanup

Removed outdated releases