Throw exception if Ability.can is used incorrectly

[stalniy]

There are few pitfalls starters do:

1. ability.can(“read”, “User”, { role: “admin” }). Throw exception if the last argument is an object
2. <Can I=“read” a=“user” of={{ role: “admin” }}>test</Can>. Throw exception when multiple subject or action properties are used (valid for React and Vue)
3. warn in development mode if Ability contains only forbidden rules (should have at least 1 regular rule)

[stalniy]

Meanwhile please read explanations in #59

[stalniy]

released in @casl/[email protected]