[maven-release-plugin] prepare release gson-2.2.2
[maven-release-plugin] prepare release gson-2.2.2

mbrukman/gson,testcenter/gson,gv2011/jsoncore,todoooo/gson,testcenter/gson,DanySK/gson-extras,google/gson,mbrukman/gson,todoooo/gson,DanySK/gson-extras,DanySK/gson-extras,testcenter/gson,todoooo/gson,mbrukman/gson