[nemo-qml-plugin-social] Fix arbitrary request reply.

Reply was always empty since local variable was never assigned to
class member variable.
Merge branch 'master' of https://github.com/nemomobile/nemo-qml-plugin-social

Conflicts:
	src/socialnetworkinterface.cpp
Merge pull request #15 from VDVsx/master

[nemo-qml-plugin-social] Fix arbitrary request reply.