Change curlOptions to match server configuration

New clear_cache function to remove downloaded datasets and EM
Add read from file to .downloadMatrix for test.immunespace.org
Fix PRODUCTION_PATH in .downloadMatrix
Fix http authentication

Enforce https
Add extra options to .downloadMatrix
Fix clear_cache and .isRunningLocally
Merge branch 'gottweb'

Conflicts:
	R/ImmuneSpace.R