[libqofono] Don't change DBus properties unless they change.

If the local cached value of a DBus property is the same as the new
value don't bother sending the DBus command.
Merge pull request #38 from amccarthy/master

[libqofono] Don't change DBus properties unless they change.
Merge pull request #37 from martyone/master

Fix number of bugs, update tests for the current API
bump version to 0.53
[libqofono] Emit change signals when initializing QOfonoModem
Merge pull request #39 from pgerdt/fix-ofonomodem-signals

Emit change signals when initializing QOfonoModem
[libqofono] Correct property type.

The QOfonoModem::valid property was declared as type QString in
Q_PROPERTY when it is in fact a bool.
Merge pull request #40 from amccarthy/master

[libqofono] Correct property type.
Bump version to 0.54
Use QT_INSTALL_LIBS for library install paths to enable installation to multi-arch directories
Merge pull request #41 from sil2100/master

[libqofono] Use QT_INSTALL_LIBS for library install paths
[libqofono] Complete the disableAll barring API.
Merge pull request #42 from martinjones/barring_all

[libqofono] Complete the disableAll barring API.
QOfonoSimManager: expose serviceNumbers as a property
Merge pull request #43 from kenvandine/serviceNumbers

QOfonoSimManager: expose serviceNumbers as a property
Tests: add dependency to phonesim