bump targetSdkVersion to 21
bump versionCode to 3020 to give room for 0.3.1.x releases for non-PIE

In case anyone wants to make non-PIE fix releases based on 0.3.1, setting
the version code to allow for that possibility.
set minSdkVersion to 16, the earliest platform to support PIE

android-21 now requires -pie -fPIE on all executables to run, but PIE was
not supported until android-16.

https://code.google.com/p/android-developer-preview/issues/detail?id=888
android-support-v4.jar properties file to set javadoc path
update to latest appcompat-v7 (v21.0.3)
update to npth v1.0
update gnupg to v2.1.0
update to gpgme v1.5.3
update libassuan to v2.2.0
update to libgcrypt v1.6.2
update libgpg-error to v1.17
update libksba to v1.3.2
REMOVE ME/DO NOT MERGE debug flags for native builds

Do not ever include this commit in the official repo!  Its for debugging only!
REMOVE ME/DO NOT MERGE enable debug logs

Do not ever include this commit in the official repo!  Its for debugging only!