chore(avl_array): removed test asserts

perf(avl_array): iterator find() performance slightly improved as well

docs(readme): update readme

Merge branch 'travis'

test(test_suite): add more 'erase' test cases

chore(readme): fix fast mode table

chore(avl_array): cleanup and comments

docs(avl_array): update comments

fix(avl_array): avoid iterator increment over end()