new configure! methods for GtkAdjustment and GtkSpinButton

[jwahlstrand]

Create wrappers for gtk_adjustment_configure and gtk_spin_button_configure, which let you alter multiple properties while emitting only one changed signal.

[coveralls]

Pull Request Test Coverage Report for Build 3672214645

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 22 of 22 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.4%) to 64.657%

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Totals
Change from base Build 3594853211:	1.4%
Covered Lines:	1705
Relevant Lines:	2637

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💛 - Coveralls