Include opencv libs & avoid absolute path?

[qingdo]

Hi, thanks for your sharing. This is a great project. However, when I was using it, I found several places that can make it even better. Firstly, I think you can include the opencv module in this repo, so that people don't need to download it and link it again. Secondly, in CMakeList.txt, the project path and opencv path is absolute paths (/Users/jonathanreynolds/Documents/Projects/OpenCV-android-sdk). For newbies, this may be confusing. Thirdly, the libopencvjava3.so can also be included in the repo. Therefore, newbies won't need any extra effort to load it on a phone immediately.

Thanks for your sharing again!