Implement optimize!(args...)

[jmejia8]

Implement:

# objective function
f(x) = sum(x.^2)
bounds = [-10 -10 -10; 10 10 10.0]
# optimization method
method = ECA()
# main optimization loop
for iteration in 1:10
    optimize!(f, bounds, method)
end
result = get_result(method)

Another example:

method = ECA()
# main optimization loop
while !should_stop(method)
    optimize!(f, bounds, method)
end
result = get_result(method)

[jmejia8]

Implemented in #40