backend gtk and gtk3: destroy figure save dialog after use
Merge pull request #2074 from efiring/gtk3save

backend gtk and gtk3: destroy figure save dialog after use; closes #2073
Merge remote-tracking branch 'upstream/v1.2.x' into v1.3.x
Merge pull request #2024 from mdboom/new_logo

Update homepage image
Merge pull request #2066 from GBillotey/oversized_doc_img

[DOC] Mathtext and matshow examples
Merge pull request #2076 from cgohlke/patch-1

Build the _windowing extension
Fix Issue #2060: Text bbox alignment