Add support for versioned API

This MR restructures the way the views are implemented to allow for a versioned API. This should allow us to implement a new version of the API to better support future query types whilst still supporting legacy clients.

I have plans to write up a V2 of the API that better supports multiple file formats, so this is the first step.

This should have zero impact on functionality, and so should support queries from the current client.

config/gunicorn.conf.py

@@ -147,7 +147,8 @@ tmp_upload_dir = None
 errorlog = '-'
 loglevel = 'info'
 accesslog = '-'
-access_log_format = '%(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" "%(a)s"'
+access_log_format = '%(h)s %(l)s %(u)s %(t)s "%(r)s" %(s)s %(b)s "%(f)s" \
+                     "%(a)s"'
 
 #
 # Process naming
@@ -182,34 +183,42 @@ proc_name = None
 #       A callable that takes a server instance as the sole argument.
 #
 
+
 def post_fork(server, worker):
     server.log.info("Worker spawned (pid: %s)", worker.pid)
 
+
 def pre_fork(server, worker):
     pass
 
+
 def pre_exec(server):
     server.log.info("Forked child, re-executing.")
 
+
 def when_ready(server):
     server.log.info("Server is ready. Spawning workers")
 
+
 def worker_int(worker):
     worker.log.info("worker received INT or QUIT signal")
 
-    ## get traceback info
-    import threading, sys, traceback
+    # get traceback info
+    import threading
+    import sys
+    import traceback
     id2name = {th.ident: th.name for th in threading.enumerate()}
     code = []
     for threadId, stack in sys._current_frames().items():
-        code.append("\n# Thread: %s(%d)" % (id2name.get(threadId,""),
-            threadId))
+        code.append("\n# Thread: %s(%d)" % (id2name.get(threadId, ""),
+                    threadId))
         for filename, lineno, name, line in traceback.extract_stack(stack):
             code.append('File: "%s", line %d, in %s' % (filename,
-                lineno, name))
+                        lineno, name))
             if line:
                 code.append("  %s" % (line.strip()))
     worker.log.debug("\n".join(code))
 
+
 def worker_abort(worker):
     worker.log.info("worker received SIGABRT signal")