Merge pull request #224 from briandrawert/fix-replication-count

Fixed replication count
bumped version number to 1.7.0
Merge pull request #226 from shatterednirvana/release-1.7.0

bumped version number to 1.7.0
clarified how to use force flag in AppScalefile
Merge pull request #231 from shatterednirvana/better-error-message-for-force

clarified how to use force flag in AppScalefile
Merge branch 'testing' of github.com:AppScale/appscale-tools into fix-replication-count
comments addressed