Maven & batch script work:
 - updated AMP plugin to v4.0.0-rc.2
 - building CollectorAndroid now only leaves 1 .apk file in target/, namely: "sapelli-collector-android.apk"
     * if it is a standard build then this is a debug apk (signed with the debug key and installed to local repo with classifier "debug")
     * if it is a release build then this is a release apk (signed with the release key, zip-aligned and installed to local repo with classifier "release")
      (the 2 intermediatary apk's produced in target/ during a release build now have a .tmp extension to avoid confusion)
 - apk signing properties (keystore-path, keystore-passwd, key-alias, key-passwd) are now loaded from a release.properties file (ignore in git!) such that they no longer need to be specified as command-line arguments. This also allows us to add the release.bat (and beta-distribute.bat) script to git.
 - added maven-automated crashlytics beta upload, tied to the deploy phase (so run "mvn deploy -Prelease", or beta-distribute.bat), release notes are loaded from beta-notes.txt (ignored in git)
  - added release.bat to git (no longer contains sensitive information)
  - added beta-distribute.bat to git

Signed-off-by: Matthias Stevens <matthias.stevens@gmail.com>
Merge branch 'master' of github.com:ExCiteS/Sapelli