Added quicker failure to build.sh when local.properties not found.
Made check for local.properties more explicit
Updated build.sh to check for android config.
Added option to build.sh to update android sdk, or skip that step
Clarified prompt for android sdk update.
Fixed order of test build and real build - obv test depends on main
project.  Also fixed check for local.properties so it looks in the right
directory.
Merge pull request #106 from frontlinesms/build.sh-fixes

Build.sh fixes