Texas Hold-em!
Your task is to determine if the cards in the list makes up a straight (five cards of sequential rank) or not. The cards will always have values ranging from 2-14, where 14 is the ace.
Be aware the ace (14) also should count as value 1!
The number of cards will vary, but will never be more than 7 (the board (5) + player hand (2))
Examples:
straight: 9-10-11-12-13
straight: 14-2-3-4-5
straight: 2-7-8-5-10-9-11
not straight: 7-8-12-13-14