squish.lua: Only prepend project base path for relative paths specified in the squishy file

make_squishy: Improve 'Couldn't resolve' message

make_squishy: Fix traceback when file doesn't contain any path component

make_squishy: Fix traceback on modules that couldn't be found on the filesystem (thanks Valerio)

squish: Handle nil errors when can't pack a module

gzip: Enably uglify for gzip decompression code (reduces gzip fixed overhead by 1K)

gzip: Some changes to make embedding decompression code compatible with uglify

README: Update for new --uglify-level=full

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