Fix android build on Darwin.

This cleans up configure and Makefile.in so that things build correctly on Darwin.
Make some debug prints more useful
Remove an unneeded helper function
Handle HTTP 3xx redirects

Fixes #973.
auto merge of #977 : kmcallister/servo/redirect, r=jdm
auto merge of #826 : metajack/servo/android-darwin, r=jdm

This cleans up configure and Makefile.in so that things build correctly on Darwin.

This needs https://github.com/mozilla-servo/nss/pull/6 before it can be merged. Please hold any r+ until that lands and I push the submodule update.
Cache font-style and text-decoration to speed up can_merge_with_box()
Update submodule
auto merge of #978 : ryanhc/servo/renderbox-cache, r=metajack
Make borders show up on summit.html
auto merge of #995 : jdm/servo/demoborders, r=larsbergstrom

Fixes #993.
Fix crashes and leaks in Azure and Skia

Fixes #979.
auto merge of #996 : kmcallister/servo/azure-skia-fixes, r=larsbergstrom

Fixes #979.