Make cache invalidation more generic
Fix leftover
Make ACL name consistent (lowercase)
Improve PHPDocs
Add note on whitelisting IP addresses
Add note on optional Client
Add note on query string and variants
Fix mistake in docs
Replace HttpCache namespace with Invalidation
Remove Varnish helper, obsoleted by Invalidation\Varnish
Don't overwrite Host header set by user
State options for $hosts parameter
Explain difference between refresh and purge
Don't parse URL if Host header is already set
Merge pull request #11 from ddeboer/varnish-invalidation

Make cache invalidation more generic
Merge Travis configs
 Merge composer.json
Merge configuration
Merge PHPUnit config
Create separate installation doc