Delete some Autotools junk and update README.

Autotools autogenerated files that change frequently have been
removed, those that don't are still checked in.

.gitignore

@@ -22,4 +22,7 @@ config.status
 autom4te.cache
 config.h
 Makefile
-jq-*.tar.gz
+jq-*.tar.gz
+configure
+aclocal.m4
+Makefile.in

README.md

@@ -8,7 +8,16 @@ If you want to learn to use jq, read the documentation at
 documentation is generated from the docs/ folder of this repository.
 
 If you want to hack on jq, feel free, but be warned that its internals
-are not well-documented at the moment. Bring a hard hat and a shovel.
+are not well-documented at the moment. Bring a hard hat and a
+shovel. Also, read the wiki: http://github.com/stedolan/jq/wiki
 
-You can find some basic build instructions at
-[http://stedolan.github.com/jq/download](http://stedolan.github.com/jq/download)
+To build jq, run
+
+    ./configure
+    make
+    sudo make install (optionally)
+
+If you've just checked out the latest version from git (rather than
+using a released source tarball) then you'll need to run this first:
+
+    autoreconf