Adding brisk 1.0 copy from ICCV code drop.

[simonlynen]

@mbuerki Sorry for not being explicit but you should also add the implementation file for brisk 1.0 and the necessary parts in the cmake to actually make this being build on the server.

[mbuerki]

haha, sorry, yeah, I just tried our the list of commands you sent before to understand the git procedure without looking too closely at the code. you're right, it not very useful like this :-)

[simonlynen]

lgtm