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Adding Travis-CI which builds gateware #58
This stuff is based of the artiq stuff at https://github.com/m-labs/artiq and uses a similar method of making a cut back Xilinx ISE which is then encrypted and only made avaliable to the CI system. Because of the stripped back nature of the Xilinx ISE, changes can cause build failures if they make ISE require new files that were not previously touched. The .travis/package-xilinx.sh script can be used to recreate the package from a full ISE install.
Travis continues to use the same "quick setup scripts" we recommend people run to get up and running. It is important to keep things this way so that we have testing of the setup instructions.
As the gateware takes significantly longer than the previous firmware builds, each target now builds on a separate machine.