Hannah Einbinder is very relaxed. Stretched out on a chair like she’s at home, not a corporate meeting room in King’s Cross, the 31-year-old American comedian and actor balances a glass of water on a slim arm rest without looking. Cheery without overdoing it, she overrides the stereotype of a stand-up who’s neurotic when away from the stage. “As a person sitting across from you today, I feel the most comfortable in myself now,” she says serenely. “It took me a long time to feelhellip;read more raquo;