Test against 0.10.40

[tschellenbach]

One of our customers uses it

[tschellenbach]

@matthisk

[matthisk]

Tests seem to pass: https://travis-ci.org/GetStream/stream-node-orm/jobs/169207456.
But they should probably update a lot of our dependencies do not support such an old version of Node.

npm WARN engine eslint@3.7.1: wanted: {"node":">=4"} (current: {"node":"0.10.40","npm":"1.4.28"})
npm WARN engine getstream@3.5.0: wanted: {"node":">=0.11 <=5.7"} (current: {"node":"0.10.40","npm":"1.4.28"})
npm WARN engine form-data@2.0.0: wanted: {"node":">= 0.12"} (current: {"node":"0.10.40","npm":"1.4.28"})
npm WARN engine escodegen@1.8.1: wanted: {"node":">=0.12.0"} (current: {"node":"0.10.40","npm":"1.4.28"})
npm WARN engine strip-bom@3.0.0: wanted: {"node":">=4"} (current: {"node":"0.10.40","npm":"1.4.28"})
npm WARN engine string-width@2.0.0: wanted: {"node":">=4"} (current: {"node":"0.10.40","npm":"1.4.28"})
npm WARN engine is-fullwidth-code-point@2.0.0: wanted: {"node":">=4"} (current: {"node":"0.10.40","npm":"1.4.28"})
npm WARN engine co@4.6.0: wanted: {"iojs":">= 1.0.0","node":">= 0.12.0"} (current: {"node":"0.10.40","npm":"1.4.28"})
npm WARN engine form-data@2.0.0: wanted: {"node":">= 0.12"} (current: {"node":"0.10.40","npm":"1.4.28"})