fixed eval() for usage without supplying candidates in phenotype space
added sample code for demonstrating ask-tell interface / API, ref #45
Merge branch 'master' into internals_45
updated ask & tell sample code in order to demonstrate how to override any of the ask, eval, tell and stop functions, ref #45
Merge branch 'master' into internals_45
Merge branch 'master' into internals_45
updated example with new next iteration scheme
simplified update of consumed budget in both algorithm and solution objects
ask-tell example update