some underscore shim improvements
ditz issue update
makefile trivia
expose duk_builtin_date_get_now() internally to allow timevalues to be read internally by other modules
add underscoretest to README.md
rename test-dev-bug-xxx.js -> test-bug-xxx.js
rename test-dev-bug-xxx refs to test-bug-xxx
rename test-builtin-xxx.js -> test-bi-xxx.js
rename test-builtin-xxx.js -> test-bi-xxx.js refs
rename test-builtin-xxx -> test-bi-xxx refs in a few open ditz issues
ditz issue update
rename duk_builtin_xxx -> duk_bi_xxx in code
rename duk_builtin_xxx -> duk_bi_xxx in make and dist script
rename duk_builtin_xxx -> duk_bi_xxx in website example
rename duk_builtin_xxx -> duk_bi_xxx in a few open ditz issues
make Duktape.env nonenumerable to match builtin props
ditz issue update
remove/downgrade some FIXMEs
add very basic ecma262test run, not sure if it works properly yet
makefile tweaks: add valgrind wrapped runs for several test sets, .PHONY target cleanup, other trivia