Add application/json in headers

Fix documentation

Fix no loggregator

Close cloudfoundry-community#17

Fix tests for python 3 in setupttols environment

Upgrade to python3

Loading client without protobuf will not be blocking

See cloudfoundry-community#14

Fix documentation bug

See cloudfoundry-community#13

Merge pull request cloudfoundry-community#8 from romain-dartigues/fix…

…_setup

fix cloudfoundry-community#7: pip install broken by 5e5d45e

Fix missing import

Add access to dictionary entries as attributes and fix some tests