Expose additional multi options

Expose the multi options:
* CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE
* CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE
* CURLMOPT_MAX_HOST_CONNECTIONS
* CURLMOPT_MAX_PIPELINE_LENGTH
* CURLMOPT_MAX_TOTAL_CONNECTIONS
Move multi option constants tests into their own file
Close multi handle when finished
Use a more specific define
Update changelog
Merge pull request #156 from p-push/curl-7-30-0-pipeline-options

Curl 7 30 0 pipeline options