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Specify minimum gcr-3 requirement: Bug #737304

Earlier versions didn't include a VAPI.
Fix toolbar icon size in GTK+ 3.14: Bug #732065

By setting the icon pixel size, that forces GTK+ to load images
installed in our locations rather than the theme's.
Fix dtor names, empty if block

Latest build of Vala catches these.  if block is a logic change, but
harmless as (a) it fixes a bug that (b) is never exercised by the
application, as it does not logout of IMAP sessions.
Fix remaining icon issues with bug #732065

Archive button now loads and miscellaneous icons (including close icon
used in viewer pane) are scaled properly.

Spam icon remains too small under GTK+ 3.14.  That will be fixed with
bug #737862.
Don't show close/detach buttons twice under GTK+ 3.14: Bug #737860

Two sets of close/detach buttons are added to the inline composer to
place them according to theme layout.  For whatever reason, under
3.14 this call needs to be made when the widget is realized, whereas
before it was being called earlier.