Should be able to override the generated nicknames

Currently we have to accept the nickname that is auto generated for each operation. It would be nice to be able to specify a nickname in the endpoint directly.

/Leon

Fixing CHANGELOG.markdown to accout for the 0.7.2 release,
Adding override of auto generated nickname.

Please make this identical to the lines below. This is missing a link after the `[#100](.. here ...)`.