Remove test files from bundled gem

[greysteil]

First of all, thanks for Tilt!

This PR slims down the bundled gem by ~60% by:

• removing the test_files declaration (which is deprecated)
• removing all files which aren't required to build the gem from the files declaration. This is pretty standard practice

The same saving is a big percentage but small in absolute terms (30KB different in the .gem). Hopefully that's still worth having since this gem is downloaded millions of times.

[judofyr]

Looks good to me!

[judofyr]

Actually. That gemspec is generated in the Rakefile:

tilt/Rakefile

Line 88 in 24aff97

file 'tilt.gemspec' => FileList['{lib,test}/**','Rakefile'] do |f|

. We'd have to change that code in order for the gemspec to be respected.

[greysteil]

Updated the rakefile - generates a gemspec without tests now.

[judofyr]

Now it looks good!