Removed Size and Capability

  * The SIZE field of all protocols is gone
  * So are the associated APIs
  * All uses of `Capability` and its subclasses have been removed
minor cosmetic fixes in the DriverLauncher
Removed the TangUtils class

  * Removed the class
  * Replaced its use with the Tang idioms
Merge pull request #727 from Microsoft-CISL/weimer_removeSizeAndCapability

Removed Size and Capability
Merge branch 'master' of https://github.com/Microsoft-CISL/REEF into weimer_removeTangUtils
Merge pull request #728 from Microsoft-CISL/weimer_removeTangUtils

 Removed the TangUtils class
rename AutoCloseableHandler to NameServiceCloseHandler
Deleted some more deprecated APIs
Made NameServiceCloseHandler a handler for ContextStop
Merge pull request #729 from Microsoft-CISL/weimer_moreDeletionOfDeprecatedAPIs

Deleted some more deprecated APIs
do not log stack trace for simulated exceptions in FailTask* unit tests
suppress stack trace dumps for simulated errors in unit tests.
suppress stack trace dump for runtime errors in failure unit tests
Merge pull request #731 from Microsoft-CISL/sergiym_no_test_exceptions

Suppress stack trace dumps for failure unit tests
Merge remote-tracking branch 'origin' into reef-bridge