Add a BUILDING file, update HACKING, clean some stuff

Change-Id: I39c310556cfa7643c3d1aa271acab8ce130e0953

BUILDING

@@ -0,0 +1,12 @@
+To build Camlistore:
+
+1) Install Go 1.1 or later.
+
+2) cd to the root of the Camlistore source (where this file is)
+
+3) Run:
+
+   $ go run make.go
+
+4) The compiled binaries should now be in the "bin" subdirectory:
+   camlistored (the server), camget, camput, and camtool.

HACKING

@@ -1,12 +1,43 @@
+Camlistore contributors regularly use Linux and OS X, and both are
+100% supported.
+
+Developing on Windows is sometimes broken, but should work.  Let us
+know if we broke something, or we accidentally depend on some
+Unix-specific build tool somewhere.
+
 See http://camlistore.org/docs/contributing for information
 on how to contribute to the project and submit patches.
 
-On Debian, to get started:
+See architecture docs: https://camlistore.org/docs/
+
+You can view docs for Camlistore packages with local godoc, or
+godoc.org.
+
+It's recommended you use git to fetch the source code, rather than
+hack from a Camlistore release's zip file:
+
+$ git clone https://camlistore.org/r/p/camlistore
+
+(We use github for distribution and collaboration with some people,
+but the Gerrit git server & code review system is the main repo.)
+
+After cloning it, move the top-level directory to be named
+"camlistore.org" under your $GOPATH/src. (e.g. if your $GOPATH is
+$HOME, put the Camlistore git repo at $HOME/src/camlistore.org) This
+isn't required for normal users, but is assumed for people hacking on
+Camlistore.
+
+On Debian/Ubuntu, some deps to get started:
+
+$ sudo apt-get install libsqlite3-dev sqlite3 pkg-config git make
+
+Then we use the following scripts to run a hermetic, self-contained
+environment independent (with its own config files & storage space):
 
-$ sudo apt-get install libsqlite3-dev sqlite3 pkg-config subversion git make
 $ ./dev-server
 $ ./dev-camput
 $ ./dev-camget
+... etc.
 
-etc
+Please update this file as appropriate.
 

dev/make-release

@@ -33,6 +33,15 @@ foreach my $d (qw{
  website
  clients/chrome
  lib
+ old
+ dev-appengine
+ dev-camget
+ dev-cammount
+ dev-camput
+ dev-camtool
+ dev-db
+ dev-pass-camput
+ dev-server
 }) {
     system("git", "rm", "-r", $d) and die "Failed to git rm -r $d";
 }