No longer switch branches for go-qml dep

Dockerfile

@@ -23,12 +23,6 @@ RUN git clone https://go.googlesource.com/go golang
 RUN cd golang && git checkout go1.4.1
 RUN cd golang/src && ./make.bash && go version
 
-## Fetch and install QML
-RUN go get -u -v -d github.com/obscuren/qml
-WORKDIR $GOPATH/src/github.com/obscuren/qml
-RUN git checkout v1
-RUN go install -v
-
 # this is a workaround, to make sure that docker's cache is invalidated whenever the git repo changes
 ADD https://api.github.com/repos/ethereum/go-ethereum/git/refs/heads/develop file_does_not_exist