Move importexport to lib
Add downloads/.dummy file

This is needed for a successful initial buildout run.
Bump lxml versions

@joka: Can we take away the version definition in versions.cfg then?
Upgrade libevent from 1.4.8 -> 1.4.14b

This has been done in the meantime.
Upgrade postgres from 9.2.2 -> 9.2.3

This has been done in the meantime.
Upgrade geos from 3.3.6 to 3.3.7

This has been done in the meantime.
Upgrade solr from 3.6.1 to 3.6.2

This has been done in the meantime.