Switch to https for most links

Update obsolete links (groups, android doc on code.google.com)

Update instructions related to groups

Change-Id: I29a50cb5f026f0e1e00f2d2aadcfa2a138a96a03
diff --git a/src/source/building-devices.md b/src/source/building-devices.md
index 542b8e3..b0ee88c 100644
--- a/src/source/building-devices.md
+++ b/src/source/building-devices.md
@@ -110,7 +110,7 @@
 
 Official binaries for Nexus S, Galaxy Nexus, and PandaBoard can be
 downloaded from
-[Google's Nexus driver page](http://code.google.com/android/nexus/drivers.html),
+[Google's Nexus driver page](https://code.google.com/android/nexus/drivers.html),
 which add access to additional hardware capabilities with non-Open-Source code.
 
 There are no official binaries for Nexus One, ADP2 or ADP1.
@@ -248,7 +248,7 @@
 and
 for Nexus S (all variants)
 are available from
-[Google's factory image page](http://code.google.com/android/nexus/images.html).
+[Google's factory image page](https://code.google.com/android/nexus/images.html).
 
 Factory images for the Motorola Xoom are distributed directly by Motorola.