Double check parameterized and titlelize memory comsumption

[CristhianMotoche]

After running the memory benchmark, it seems parameterized and titlelize allocate too much memory as the input string grows:

Case                                   Allocated  GCs
toUnderscore text-len-100                  4,520    0
toUnderscore text-len-10000                4,520    0
toUnderscore text-len-1000000              4,520    0
toUnderscore all text                      4,520    0
toDashed text-len-100                      4,520    0
toDashed text-len-10000                    4,520    0
toDashed text-len-1000000                  4,520    0
toDashed all text                          4,520    0
toCamelCased False text-len-100            3,208    0
toCamelCased False text-len-10000          3,208    0
toCamelCased False text-len-1000000        3,208    0
toCamelCased False all text                3,208    0
toHumanized False text-len-100             3,208    0
toHumanized False text-len-10000           3,208    0
toHumanized False text-len-1000000         3,208    0
toHumanized False all text                 3,208    0
parameterize text-len-100                 46,992    0
parameterize text-len-10000            1,580,624    0
parameterize text-len-1000000        177,927,792   40
parameterize all text                193,121,136   44
titleize text-len-100                     11,912    0
titleize text-len-10000                1,251,528    0
titleize text-len-1000000            156,788,776   37
titleize all text                    170,481,344   40

We should double check what is happening and try to improve it if possible.