adds the possibility to set a signatureCalculator as Expression[SignatureCalculator]

This allows you to e.g. use a user-specific key to sign a request. While it has to change a few internals, it leaves the API unchanged except for adding:
  signatureCalculator(Expression[SignatureCalculator]])
as a way to specify the signature calculator
Unused import
Output Zinc compiled classes in test-classes, close #2167
Upgrade AHC 1.9.0-BETA11, disable enforceCompression, close #2159, close #2160, close #2162
Fix previous commit
Flush pooled connections once a vu is done, close #2155
use getUrl instead
mock getUrl, fix build
RecordSeqFeederBuilder data is named records, not array
Minor clean up
HTTP: support regex for current location checks

Adds regex pattern matching checks for the current location similar to how regex body checks are done.
Have doc mention Validating instead of Verifying
Rename HttpCheckTarget into HttpCheckScope
Merge pull request #2168 from llinder/feature/currentlocregex

HTTP: support regex for current location checks, close #2169
Document currentLocationRegex
scaladoc
Rename CheckFactory into Extender
Use optional instead of dontValidate
Make session available in check transform step, close #2134
Merge pull request #2164 from HNeitzel/master

HTTP: Session-Context sensitive SignatureCalculators