Updated dependencies:

flow: 0.6 -> 0.7
okhttp: 1.3 -> 1.5.4
retrofit: 1.4.1 -> 1.5.1
rxjava: 0.16.1 -> 0.17.4
rxjava-android: 0.16.1 -> 0.17.4
retrofit-mock: 1.4.1 -> 1.5.1
scalpel: 1.1.1 -> 1.1.2
espresso: 1.1-r2 -> 1.1-r3