fix($state): change default value of `inherit` option to `true`

Since #970, `href()` method takes into account the `inherit` option. This option needs to have a `true` default value in order to not introduce a breaking change.

Moreover, the `true` value is more convenient for this "high-level oriented" method.
fix($state.href): change options.inherit default to true

Merge branch 'fix' of https://github.com/ncuillery/ui-router into pr-1110
fix($state): change $state.href default options.inherit to true

Merge branch 'pr-1110'