Clean .gitignore.

Removed old ignores from directories test and server,
which we do not have / use any more.

It is now in par with .npm ignore, where the only difference
is .npm ignore ignores /external/ dir in addition to .gitignore.

.gitignore

@@ -1,12 +1,7 @@
-# Ignoring compiled files in examples etc
-server/FileServer*.js
-
 # Ignoring Mac Finder files
 .DS_Store
 
 # Ignoring test runner
-test/amber_test_runner.js
-test/run.js
 test_runner.js
 
 # In case amber is also saved in a local Subversion