[libeventfeed] Honor XDG_DATA_HOME env. variable
[libeventfeed] Fix item updating error
Use qmake variable to deal with the '-qt5' suffix
Add 'configure' qmake function

Allows autoconf-like *.in files preprocessing
[tests] Initial commit
Update package URL
Add 'check' make target
Add 'coverage' make target
[libeventfeed] Fix warning about const return type
Use QTOSTRING() instead of custom STR() macro
Add 'nodoc' CONFIG to allow disable building doc