Web tests

[rlayte]

Added some basic tests for the web handlers and moved a couple of things around in web.go to make the file structure clearer.

I branched this off develop.

[rach]

Thanks for tidying and the extra tests.. It makes much more sense.
Do you have any thoughts about #1
I would like to add gzip (#11) support for the api as it's quite a repetitive json which will gzip well. I can do it by hand but maybe it will be good to start using a web library.
I found http://www.gorillatoolkit.org/ quite nice as it's a bit a pick and choose of what you need and it will also reduce the code for context. Let me know if you have any suggestions as I have zero experiences with the differents Go libs for the web.