Merge pull request #75 from Vesuri/master

[lipstick] Don't set the size of the HomeWindow's root item - let the item handle its own size
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[lipstick] Give a warning if home window component loading fails
Merge pull request #76 from jpetrell/master

[lipstick] Give a warning if home window component loading fails
[lipstick] Allow the compositor to turn the display off
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[lipstick] Use libcontentaction to open URLs also when it's Lipstick itself opening the URLs
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