updating httprequest lib to lastest for redirect method
using android.com for the default hostname as it does not auto redirect like google.com but has a similar latency when pinging
no longer following redirects in the head request
Merge branch 'switching_from_httpget_to_httphead' into dissallowing_host_ping_redirects

Conflicts:
	core/src/main/java/com/novoda/merlin/Merlin.java
Merge branch 'master' of github.com:novoda/merlin into dissallowing_host_ping_redirects
Merge pull request #25 from novoda/dissallowing_host_ping_redirects

#17 Dissallowing host ping redirects