pom.xml: update to base pom 0.1.12
pom.xml: update to base pom 0.1.12

The main change is the serialization bump to 2.2.2 which fixes
a PermGen leak.

This patch also cleans-up the pom by getting rid of unnecessary
versions.

Signed-off-by: Pierre-Alexandre Meyer <ff019a5748a52b5641624af88a54a2f0e46a9fb5@ning.com>

pierre/collector,ning/collector,ning/collector,pierre/collector,pierre/collector,ning/collector,ning/collector,pierre/collector,pierre/collector,pierre/collector,ning/collector