Only require QtTest if needed
Drop QJson for Qt5
Merge pull request #18 from xhochy/drop-qjson-for-qt5

Drop QJson for Qt5
Merge pull request #17 from xhochy/no-test-no-qttest

Only require QtTest if needed
libechonest only depends for Qt4 on QJson
Merge pull request #19 from xhochy/no-qjson-qt5-pc

libechonest only depends for Qt4 on QJson
check if JsonDocument is null in JsonWrapper
use different names for qt5 build of echonest
Merge pull request #20 from Horrendus/master

use different names for qt5 build of echonest