Support go 1.6

[zoli]

Currently it panics due to shared pointers without exporting GODEBUG=cgocheck=0.
Some related discussions go-qml#170.

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[neclepsio]

@SjB fixed this in https://github.com/SjB/qml/tree/go1.6-port

His commits cannot be applied directly mainly because of the split of qml.go.

[amlwwalker]

Would be good if this got merged in to take advantage of the limetext updates plus the Go 1.6+ port from @SjB

Is there a plan to do this?