chore(tests): updates jasmine version
fix(record_api): Improves url building and adds support for falsy `$pk`s

Makes the scope's `$urlFor` method look for a `$buildUrl` method in the
scoped resource, if available, then url building responsability is
given to the resource.

Fixes #205
feat(common_api): Adds the posibility to override the cannonical url
for nested resources.
feat(relations): adds hasMany and hasOne hooks.

Also adds hasMany `params` option.

Closes #35, #28