Merge branch 'release/0.0.86' into develop
example: Perceptron Learning Algorithm
src: add instance method 'kernel()'
test: add instance method 'kernel()' testings
readme: add instance method 'kernel()' api
npm: 0.0.86 -> 0.0.87
lint: add some files for linting pass
test: fix the mistake testing for GCC
Merge branch 'release/0.0.87'