Add apache expires module for proper caching headers

[ericduran]

Small Perf, Parity, Consistency wins!

[msound]

This looks straight forward :+1:

Also, it looks like Acquia has two more modules enabled passenger and reqtimeout. Not sure if we need them.

[ericduran]

hmm passenger we can skip it's super ruby heavy, I'll add reqtimeout

[scottrigby]

@ericduran This looks mergable as-is… but do u want to wait to merge this till reqtimeout is added?

[ericduran]

na, we can merge it as is :+1: