Fix invalid CFBundleShortVersionString
Fix invalid CFBundleShortVersionString

* Basically, the value for key CFBundleShortVersionString must be a period-separated list of at most three non-negative integers.

* Change from 2.0DB0XX pattern to just 2.0.0.

* Set Build number to zero. The CI build will set the build number. If the developer is using Cocoapods or Carthage, the build number will always be zero.

couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios