I'm looking for a site where I can see the starting lineups a team used each day for an entire season.
A random example, I want to know who the Rockies starters were and where they batted through out the whole season. I want to know each games lineup for the Rockies.
caspian882015-08-05T12:38:32Z
Baseball Reference has much of this data.
Linked are the 2015 batting orders for the Colorado Rockies, as per your example. Virtually every team has this data going back to 1915 or so - just find a team and then find their batting order page.
www.baseballreference.com gives you that info. There is a link to show you each team, then pick the season you want to view. Finally, click on the link for "Schedule and results". it will show all games played and a clickable link to each game's boxscore.