Fix conditional reader bug with unknown packages

The reader failed if a conditional expression is skipped because the
package did not exist. For example:

 #+FOO (package:bar)
Support for full feature expressions in the reader
Add *VERBOSE* to enable printing of toplevel forms as they're compiled.
Fix (COPY-LIST NIL), and add a few tests for COPY-LIST.

Previously this returned (NIL)
Fix test system to run also in the host system again
Merge pull request #155 from orodley/verbose-compilation

Add *VERBOSE* to enable printing of toplevel forms as they're compiled.
Merge pull request #157 from orodley/copy-list-nil

Fix (COPY-LIST NIL), and add a few tests for COPY-LIST.
Verbose compilation with -v flag
Fix format for stream arguments
Make jscl.lisp load in Clozure Common Lisp (CCL).
CCL doesn't remember macro definitions across file compiles,
even inside WITH-COMPILATION-UNIT.
So load the fasls right after compiling them, intead of in a separate load loop.
Implement the sharpsign vertical-bar (#| |#) reader macro.
Add tests for sharpsign vertical-bar.
Merge pull request #159 from orodley/sharpsign-vertical-bar

Implement the sharpsign vertical bar reader macro.
Merge pull request #158 from billstclair/master

Make jscl.lisp load in Clozure Common Lisp (CCL).
Make CAR and CDR reject non-list argument
Merge pull request #162 from jnjcc/master

CAR and CDR signal error on non-list arguments
Define %JS-TRY internal compilation form

This form allows us to catch arbitrary Javascript exceptions from Lisp
code.
Print informative errors in the REPL

Fix #156 using new %JS-TRY to detect errors and show errors.
Merge branch 'master' into gh-pages
Add build date notice in the repl