refactoring with error messages

added config to change number of cores for executors in SIMR
added config to change number of cores for executors in SIMR
Avoiding system exit
stop() driver instead of exit() in the end of example.
Added functionality to stop executors.
system.shutdown on akka
local versions commited
New files
using AkkaUtils
delay
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deleting these
reverting
no wildcard imports
stupid output text modified back to original
Remove driver url file after as master is terminating
Create temporary driver url file and 'atomically' rename to actual file

renamed class fixed

renamed class fixed
renamed class fixed