GEODE-2516: Fix quickstart install to retain permissions.
GEODE-2516: Fix quickstart install to retain permissions.

- By default cmake install unsets the execute bit. To retain it add USE_SOURCE_PERMISSIONS flag.

This closes #22.

mmartell/geode-native,pivotal-jbarrett/geode-native,PivotalSarge/geode-native,pivotal-jbarrett/geode-native,mhansonp/geode-native,PivotalSarge/geode-native,PivotalSarge/geode-native,PivotalSarge/geode-native,pivotal-jbarrett/geode-native,PivotalSarge/geode-native,pivotal-jbarrett/geode-native,mhansonp/geode-native,mhansonp/geode-native,PivotalSarge/geode-native,pivotal-jbarrett/geode-native,pivotal-jbarrett/geode-native,mmartell/geode-native,mmartell/geode-native,mmartell/geode-native,mmartell/geode-native,mhansonp/geode-native,pivotal-jbarrett/geode-native,mhansonp/geode-native