Fix version for make dist on master

- Re-remove VERSION file and all traces of it
 - Pass a decent version indicator to AC_INIT (using git describe)

When we tag 1.4 this will produce 1.4 as the version string when
building on the HEAD of that tag.

configure.ac

@@ -1,4 +1,6 @@
-AC_INIT([jq], [1.3], [mu@netsoc.tcd.ie],
+m4_define([jq_version], m4_esyscmd_s([git describe --always --dirty --match 'jq-*'|sed 's/^jq-//']))
+
+AC_INIT([jq], [jq_version], [mu@netsoc.tcd.ie],
              [jq], [http://stedolan.github.com/jq/])
 
 dnl Created autoconf implementation thompson@dtosolutions, 26NOV12