Make blinken compatible with sensu 0.13

In sensu 0.13 some non-backward compatible changes have been introduced.
Specifically, the sensu api are returning JSON incompatible with the
sensu 0.12.6 (and older) blinken parser.
This PR adds a sensu0_13 profile that will allow blinken users to make
use of sensu 0.13 and newer. The changes have been tested with sensu
0.16.
Merge pull request #20 from queeno/make_blinken_compatible_with_sensu0_13

Make blinken compatible with sensu 0.13+